diff --git a/Marco.Pms.DataAccess/Data/ApplicationDbContext.cs b/Marco.Pms.DataAccess/Data/ApplicationDbContext.cs
index 5f9e40f..b756a86 100644
--- a/Marco.Pms.DataAccess/Data/ApplicationDbContext.cs
+++ b/Marco.Pms.DataAccess/Data/ApplicationDbContext.cs
@@ -133,6 +133,12 @@ namespace Marco.Pms.DataAccess.Data
         public DbSet<ProjectServiceMapping> ProjectServiceMappings { get; set; }
         public DbSet<ProjectOrgMapping> ProjectOrgMappings { get; set; }
 
+        // Inventory
+        //public DbSet<PurchaseOrderStatus> PurchaseOrderStatus { get; set; }
+        //public DbSet<RequisitionStatus> RequisitionStatus { get; set; }
+        //public DbSet<PurchaseStatusMapping> PurchaseStatusMappings { get; set; }
+        //public DbSet<RequisitionStatusMapping> RequisitionStatusMappings { get; set; }
+
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
diff --git a/Marco.Pms.Model/Dtos/Activities/CreateWorkStatusMasterDto.cs b/Marco.Pms.Model/Dtos/Activities/CreateWorkStatusMasterDto.cs
index b4ff25f..8b99f62 100644
--- a/Marco.Pms.Model/Dtos/Activities/CreateWorkStatusMasterDto.cs
+++ b/Marco.Pms.Model/Dtos/Activities/CreateWorkStatusMasterDto.cs
@@ -2,7 +2,7 @@
 {
     public class CreateWorkStatusMasterDto
     {
-        public string? Name { get; set; }
-        public string? Description { get; set; }
+        public required string Name { get; set; }
+        public required string Description { get; set; }
     }
 }
diff --git a/Marco.Pms.Model/Dtos/Activities/UpdateWorkStatusMasterDto.cs b/Marco.Pms.Model/Dtos/Activities/UpdateWorkStatusMasterDto.cs
index a40052f..48dca5d 100644
--- a/Marco.Pms.Model/Dtos/Activities/UpdateWorkStatusMasterDto.cs
+++ b/Marco.Pms.Model/Dtos/Activities/UpdateWorkStatusMasterDto.cs
@@ -3,7 +3,7 @@
     public class UpdateWorkStatusMasterDto
     {
         public Guid Id { get; set; }
-        public string? Name { get; set; }
-        public string? Description { get; set; }
+        public required string Name { get; set; }
+        public required string Description { get; set; }
     }
 }
diff --git a/Marco.Pms.Model/Dtos/Inventory/PurchaseOrderStatusDto.cs b/Marco.Pms.Model/Dtos/Inventory/PurchaseOrderStatusDto.cs
new file mode 100644
index 0000000..f04ad08
--- /dev/null
+++ b/Marco.Pms.Model/Dtos/Inventory/PurchaseOrderStatusDto.cs
@@ -0,0 +1,9 @@
+namespace Marco.Pms.Model.Dtos.Inventory
+{
+    public class PurchaseOrderStatusDto
+    {
+        public Guid? Id { get; set; }
+        public required string Name { get; set; }
+        public required string Description { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Dtos/Inventory/RequisitionStatusDto.cs b/Marco.Pms.Model/Dtos/Inventory/RequisitionStatusDto.cs
new file mode 100644
index 0000000..c5cc491
--- /dev/null
+++ b/Marco.Pms.Model/Dtos/Inventory/RequisitionStatusDto.cs
@@ -0,0 +1,9 @@
+namespace Marco.Pms.Model.Dtos.Inventory
+{
+    public class RequisitionStatusDto
+    {
+        public Guid? Id { get; set; }
+        public required string Name { get; set; }
+        public required string Description { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/Item.cs b/Marco.Pms.Model/Inventory/Item.cs
new file mode 100644
index 0000000..e4525b2
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/Item.cs
@@ -0,0 +1,40 @@
+using Marco.Pms.Model.Employees;
+using Marco.Pms.Model.Master;
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class Item : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+        public Guid ItemGroupId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ItemGroupId")]
+        public ItemGroupMaster? ItemGroup { get; set; }
+        public Guid TechnicalUnitId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("TechnicalUnitId")]
+        public TechnicalUnit? ItemCategTechnicalUnitory { get; set; }
+        public string ItemUId { get; set; } = "Item-00001";
+        public int Threshold { get; set; }
+        public bool IsActive { get; set; } = true;
+        public DateTime CreatedAt { get; set; }
+        public Guid CreatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("CreatedById")]
+        public Employee? CreatedBy { get; set; }
+        public DateTime? UpdatedAt { get; set; }
+        public Guid? UpdatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("UpdatedById")]
+        public Employee? UpdatedBy { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/ItemCategoryMaster.cs b/Marco.Pms.Model/Inventory/ItemCategoryMaster.cs
new file mode 100644
index 0000000..f390fd4
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/ItemCategoryMaster.cs
@@ -0,0 +1,12 @@
+using Marco.Pms.Model.Utilities;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class ItemCategoryMaster : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+        public bool IsActive { get; set; } = true;
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/ItemGroupMaster.cs b/Marco.Pms.Model/Inventory/ItemGroupMaster.cs
new file mode 100644
index 0000000..9a468e4
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/ItemGroupMaster.cs
@@ -0,0 +1,18 @@
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class ItemGroupMaster
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+        public bool IsActive { get; set; } = true;
+        public Guid ItemCategoryId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ItemCategoryId")]
+        public ItemCategoryMaster? ItemCategory { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/ItemManufacturerMapping.cs b/Marco.Pms.Model/Inventory/ItemManufacturerMapping.cs
new file mode 100644
index 0000000..1f8a82b
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/ItemManufacturerMapping.cs
@@ -0,0 +1,23 @@
+using Marco.Pms.Model.Master;
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class ItemManufacturerMapping : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid ItemId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ItemId")]
+        public Item? Item { get; set; }
+        public Guid ManufacturerId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ManufacturerId")]
+        public Manufacturer? Manufacturer { get; set; }
+        public bool IsActive { get; set; } = true;
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/ItemSupplierMapping.cs b/Marco.Pms.Model/Inventory/ItemSupplierMapping.cs
new file mode 100644
index 0000000..4348ef5
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/ItemSupplierMapping.cs
@@ -0,0 +1,31 @@
+using Marco.Pms.Model.Master;
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class ItemSupplierMapping : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid ItemManufacturerMappingId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ItemManufacturerMappingId")]
+        public ItemManufacturerMapping? ItemManufacturerMapping { get; set; }
+        public Guid SupplierId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("SupplierId")]
+        public Supplier? Supplier { get; set; }
+        public double BasePrice { get; set; }
+        public int PurchaseLeadTime { get; set; }
+        public Guid CurrencyId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("CurrencyId")]
+        public CurrencyMaster? Currency { get; set; }
+        public bool IsActive { get; set; } = true;
+    }
+}
+
diff --git a/Marco.Pms.Model/Inventory/ItemTaxTypeMapping.cs b/Marco.Pms.Model/Inventory/ItemTaxTypeMapping.cs
new file mode 100644
index 0000000..d225d3e
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/ItemTaxTypeMapping.cs
@@ -0,0 +1,24 @@
+using Marco.Pms.Model.Master;
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class ItemTaxTypeMapping : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid ItemId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ItemId")]
+        public Item? Item { get; set; }
+        public Guid ServicesTaxTypeId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ServicesTaxTypeId")]
+        public ServicesTaxType? ServicesTaxType { get; set; }
+        public int Rate { get; set; }
+        public bool IsActive { get; set; } = true;
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/PurchaseOrder.cs b/Marco.Pms.Model/Inventory/PurchaseOrder.cs
new file mode 100644
index 0000000..ade7321
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/PurchaseOrder.cs
@@ -0,0 +1,50 @@
+using Marco.Pms.Model.Employees;
+using Marco.Pms.Model.Projects;
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class PurchaseOrder : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid ItemSupplierMappingId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ItemSupplierMappingId")]
+        public ItemSupplierMapping? ItemSupplierMapping { get; set; }
+        public Guid ProjectId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ProjectId")]
+        public Project? Project { get; set; }
+        public Guid RequisitionBatchId { get; set; }
+        public int NumberOfItems { get; set; }
+        public double PricePerItem { get; set; }
+        public double TotalBasePrice { get; set; }
+        public double TotalTaxPrice { get; set; }
+        public double TotalDiscountPrice { get; set; }
+        public double TotalPrice { get; set; }
+        public Guid PurchaseOrderStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("PurchaseOrderStatusId")]
+        public PurchaseOrderStatus? PurchaseOrderStatus { get; set; }
+        public Guid BatchId { get; set; }
+        public string PurchaseOrderUId { get; set; } = "PO-00001";
+        public bool IsActive { get; set; } = true;
+        public DateTime CreatedAt { get; set; }
+        public Guid CreatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("CreatedById")]
+        public Employee? CreatedBy { get; set; }
+        public DateTime? UpdatedAt { get; set; }
+        public Guid? UpdatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("UpdatedById")]
+        public Employee? UpdatedBy { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Marco.Pms.Model/Inventory/PurchaseOrderStatus.cs b/Marco.Pms.Model/Inventory/PurchaseOrderStatus.cs
new file mode 100644
index 0000000..4625a1d
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/PurchaseOrderStatus.cs
@@ -0,0 +1,12 @@
+using Marco.Pms.Model.Utilities;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class PurchaseOrderStatus : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+        public bool IsActive { get; set; } = true;
+    }
+}
\ No newline at end of file
diff --git a/Marco.Pms.Model/Inventory/PurchaseOrderStatusLogs.cs b/Marco.Pms.Model/Inventory/PurchaseOrderStatusLogs.cs
new file mode 100644
index 0000000..5ee91f2
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/PurchaseOrderStatusLogs.cs
@@ -0,0 +1,29 @@
+using Marco.Pms.Model.Employees;
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class PurchaseOrderStatusLogs : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid PreviousPurchaseStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("PreviousPurchaseStatusId")]
+        public PurchaseOrderStatus? PreviousPurchaseStatus { get; set; }
+        public string? Comment { get; set; }
+        public Guid PurchaseStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("PurchaseStatusId")]
+        public PurchaseOrderStatus? PurchaseStatus { get; set; }
+        public DateTime UpdatedAt { get; set; }
+        public Guid UpdatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("UpdatedById")]
+        public Employee? UpdatedBy { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Marco.Pms.Model/Inventory/PurchaseStatusEmployeeMapping.cs b/Marco.Pms.Model/Inventory/PurchaseStatusEmployeeMapping.cs
new file mode 100644
index 0000000..78673a1
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/PurchaseStatusEmployeeMapping.cs
@@ -0,0 +1,23 @@
+using Marco.Pms.Model.Employees;
+using Marco.Pms.Model.Master;
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class PurchaseStatusEmployeeMapping : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid PurchaseOrderStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("PurchaseOrderStatusId")]
+        public PurchaseOrderStatus? PurchaseOrderStatus { get; set; }
+        public Guid EmployeeId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("EmployeeId")]
+        public Employee? Employee { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/PurchaseStatusMapping.cs b/Marco.Pms.Model/Inventory/PurchaseStatusMapping.cs
new file mode 100644
index 0000000..f9ec199
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/PurchaseStatusMapping.cs
@@ -0,0 +1,26 @@
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class PurchaseStatusMapping : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid PreviousPurchaseStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("PreviousPurchaseStatusId")]
+        public PurchaseOrderStatus? PreviousPurchaseStatus { get; set; }
+        public Guid PurchaseStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("PurchaseStatusId")]
+        public PurchaseOrderStatus? PurchaseStatus { get; set; }
+        public Guid NextPurchaseStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("NextPurchaseStatusId")]
+        public PurchaseOrderStatus? NextPurchaseStatus { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Marco.Pms.Model/Inventory/Requisition.cs b/Marco.Pms.Model/Inventory/Requisition.cs
new file mode 100644
index 0000000..755da90
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/Requisition.cs
@@ -0,0 +1,44 @@
+using Marco.Pms.Model.Employees;
+using Marco.Pms.Model.Projects;
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class Requisition : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid ItemId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ItemId")]
+        public Item? Item { get; set; }
+        public Guid ProjectId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("ProjectId")]
+        public Project? Project { get; set; }
+        public Guid BatchId { get; set; }
+        public int NumberOfItems { get; set; }
+        public Guid RequisitionStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("RequisitionStatusId")]
+        public RequisitionStatus? RequisitionStatus { get; set; }
+        public string RequisitionUId { get; set; } = "Requisition-00001";
+        public bool IsActive { get; set; } = true;
+        public DateTime CreatedAt { get; set; }
+        public Guid CreatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("CreatedById")]
+        public Employee? CreatedBy { get; set; }
+        public DateTime? UpdatedAt { get; set; }
+        public Guid? UpdatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("UpdatedById")]
+        public Employee? UpdatedBy { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/RequisitionStatus.cs b/Marco.Pms.Model/Inventory/RequisitionStatus.cs
new file mode 100644
index 0000000..cd0023a
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/RequisitionStatus.cs
@@ -0,0 +1,12 @@
+using Marco.Pms.Model.Utilities;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class RequisitionStatus : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+        public bool IsActive { get; set; } = true;
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/RequisitionStatusEmployeeMapping.cs b/Marco.Pms.Model/Inventory/RequisitionStatusEmployeeMapping.cs
new file mode 100644
index 0000000..c6c0f6e
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/RequisitionStatusEmployeeMapping.cs
@@ -0,0 +1,21 @@
+using Marco.Pms.Model.Employees;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class RequisitionStatusEmployeeMapping
+    {
+        public Guid Id { get; set; }
+        public Guid RequisitionStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("RequisitionStatusId")]
+        public RequisitionStatus? RequisitionStatus { get; set; }
+        public Guid EmployeeId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("EmployeeId")]
+        public Employee? Employee { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/RequisitionStatusLogs.cs b/Marco.Pms.Model/Inventory/RequisitionStatusLogs.cs
new file mode 100644
index 0000000..a580e21
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/RequisitionStatusLogs.cs
@@ -0,0 +1,28 @@
+using Marco.Pms.Model.Employees;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class RequisitionStatusLogs
+    {
+        public Guid Id { get; set; }
+        public Guid PreviousRequisitionStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("PreviousRequisitionStatusId")]
+        public PurchaseOrderStatus? PreviousRequisitionStatus { get; set; }
+        public string? Comment { get; set; }
+        public Guid RequisitionStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("RequisitionStatusId")]
+        public RequisitionStatus? RequisitionStatus { get; set; }
+        public DateTime UpdatedAt { get; set; }
+        public Guid UpdatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("UpdatedById")]
+        public Employee? UpdatedBy { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/RequisitionStatusMapping.cs b/Marco.Pms.Model/Inventory/RequisitionStatusMapping.cs
new file mode 100644
index 0000000..6590a38
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/RequisitionStatusMapping.cs
@@ -0,0 +1,26 @@
+using Marco.Pms.Model.Utilities;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class RequisitionStatusMapping : TenantRelation
+    {
+        public Guid Id { get; set; }
+        public Guid PreviousRequisitionStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("PreviousRequisitionStatusId")]
+        public RequisitionStatus? PreviousRequisitionStatus { get; set; }
+        public Guid RequisitionStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("RequisitionStatusId")]
+        public RequisitionStatus? RequisitionStatus { get; set; }
+        public Guid NextRequisitionStatusId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("NextRequisitionStatusId")]
+        public RequisitionStatus? NextRequisitionStatus { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Inventory/Supplier.cs b/Marco.Pms.Model/Inventory/Supplier.cs
new file mode 100644
index 0000000..b1f95e6
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/Supplier.cs
@@ -0,0 +1,31 @@
+using Marco.Pms.Model.Employees;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class Supplier
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string? Email { get; set; }
+        public string SupplierGroup { get; set; } = default!;
+        public string BankName { get; set; } = default!;
+        public string AccountNumber { get; set; } = default!;
+        public string IFSC { get; set; } = default!;
+        public string SupplierUId { get; set; } = "Supplier-00001";
+        public bool IsActive { get; set; } = true;
+        public DateTime CreatedAt { get; set; }
+        public Guid CreatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("CreatedById")]
+        public Employee? CreatedBy { get; set; }
+        public DateTime? UpdatedAt { get; set; }
+        public Guid? UpdatedById { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("UpdatedById")]
+        public Employee? UpdatedBy { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Marco.Pms.Model/Inventory/SupplierStateMapping.cs b/Marco.Pms.Model/Inventory/SupplierStateMapping.cs
new file mode 100644
index 0000000..0a92c99
--- /dev/null
+++ b/Marco.Pms.Model/Inventory/SupplierStateMapping.cs
@@ -0,0 +1,29 @@
+using Marco.Pms.Model.Master;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Inventory
+{
+    public class SupplierStateMapping
+    {
+        public Guid Id { get; set; }
+        public Guid StateId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("StateId")]
+        public StateMaster? State { get; set; }
+        public string Street { get; set; } = default!;
+        public string CityName { get; set; } = default!;
+        public string PinCode { get; set; } = default!;
+        public string Country { get; set; } = default!;
+        public string GSTNumber { get; set; } = default!;
+        public string ContactPerson { get; set; } = default!;
+        public string ContactEmail { get; set; } = default!;
+        public string ContactPhone { get; set; } = default!;
+        public Guid SupplierId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("SupplierId")]
+        public Supplier? Supplier { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Marco.Pms.Model/Master/Manufacturer.cs b/Marco.Pms.Model/Master/Manufacturer.cs
new file mode 100644
index 0000000..8289184
--- /dev/null
+++ b/Marco.Pms.Model/Master/Manufacturer.cs
@@ -0,0 +1,8 @@
+namespace Marco.Pms.Model.Master
+{
+    public class Manufacturer
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+    }
+}
diff --git a/Marco.Pms.Model/Master/ServicesTaxType.cs b/Marco.Pms.Model/Master/ServicesTaxType.cs
new file mode 100644
index 0000000..565b15f
--- /dev/null
+++ b/Marco.Pms.Model/Master/ServicesTaxType.cs
@@ -0,0 +1,9 @@
+namespace Marco.Pms.Model.Master
+{
+    public class ServicesTaxType
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+    }
+}
diff --git a/Marco.Pms.Model/Master/StateMaster.cs b/Marco.Pms.Model/Master/StateMaster.cs
new file mode 100644
index 0000000..60b87b8
--- /dev/null
+++ b/Marco.Pms.Model/Master/StateMaster.cs
@@ -0,0 +1,10 @@
+namespace Marco.Pms.Model.Master
+{
+    public class StateMaster
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+        public int StateCode { get; set; } = default!;
+    }
+}
diff --git a/Marco.Pms.Model/Master/TaxSlabMaster.cs b/Marco.Pms.Model/Master/TaxSlabMaster.cs
new file mode 100644
index 0000000..acb3464
--- /dev/null
+++ b/Marco.Pms.Model/Master/TaxSlabMaster.cs
@@ -0,0 +1,8 @@
+namespace Marco.Pms.Model.Master
+{
+    public class TaxSlabMaster
+    {
+        public Guid Id { get; set; }
+        public int Percentage { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Marco.Pms.Model/Master/TechnicalUnit.cs b/Marco.Pms.Model/Master/TechnicalUnit.cs
new file mode 100644
index 0000000..cfd0567
--- /dev/null
+++ b/Marco.Pms.Model/Master/TechnicalUnit.cs
@@ -0,0 +1,17 @@
+using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Marco.Pms.Model.Master
+{
+    public class TechnicalUnit
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+        public Guid UnitTypeId { get; set; }
+
+        [ValidateNever]
+        [ForeignKey("UnitTypeId")]
+        public UnitType? UnitType { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/Master/UnitType.cs b/Marco.Pms.Model/Master/UnitType.cs
new file mode 100644
index 0000000..a87e9ef
--- /dev/null
+++ b/Marco.Pms.Model/Master/UnitType.cs
@@ -0,0 +1,9 @@
+namespace Marco.Pms.Model.Master
+{
+    public class UnitType
+    {
+        public Guid Id { get; set; }
+        public string Name { get; set; } = default!;
+        public string Description { get; set; } = default!;
+    }
+}
diff --git a/Marco.Pms.Model/ViewModels/Inventory/PurchaseOrderStatusDetailsVM.cs b/Marco.Pms.Model/ViewModels/Inventory/PurchaseOrderStatusDetailsVM.cs
new file mode 100644
index 0000000..1a905fe
--- /dev/null
+++ b/Marco.Pms.Model/ViewModels/Inventory/PurchaseOrderStatusDetailsVM.cs
@@ -0,0 +1,12 @@
+namespace Marco.Pms.Model.ViewModels.Inventory
+{
+    public class PurchaseOrderStatusDetailsVM
+    {
+        public Guid Id { get; set; }
+        public string? Name { get; set; }
+        public string? Description { get; set; }
+        public bool IsActive { get; set; }
+        public List<PurchaseOrderStatusVM>? PreviousPurchaseStatus { get; set; }
+        public List<PurchaseOrderStatusVM>? NextPurchaseStatus { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/ViewModels/Inventory/PurchaseOrderStatusVM.cs b/Marco.Pms.Model/ViewModels/Inventory/PurchaseOrderStatusVM.cs
new file mode 100644
index 0000000..a3580c7
--- /dev/null
+++ b/Marco.Pms.Model/ViewModels/Inventory/PurchaseOrderStatusVM.cs
@@ -0,0 +1,10 @@
+namespace Marco.Pms.Model.ViewModels.Inventory
+{
+    public class PurchaseOrderStatusVM
+    {
+        public Guid Id { get; set; }
+        public string? Name { get; set; }
+        public string? Description { get; set; }
+        public bool IsActive { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/ViewModels/Inventory/RequisitionStatusDetailsVM.cs b/Marco.Pms.Model/ViewModels/Inventory/RequisitionStatusDetailsVM.cs
new file mode 100644
index 0000000..ac21a4f
--- /dev/null
+++ b/Marco.Pms.Model/ViewModels/Inventory/RequisitionStatusDetailsVM.cs
@@ -0,0 +1,12 @@
+namespace Marco.Pms.Model.ViewModels.Inventory
+{
+    public class RequisitionStatusDetailsVM
+    {
+        public Guid Id { get; set; }
+        public string? Name { get; set; }
+        public string? Description { get; set; }
+        public bool IsActive { get; set; }
+        public List<RequisitionStatusVM>? PreviousRequisitionStatus { get; set; }
+        public List<RequisitionStatusVM>? NextRequisitionStatus { get; set; }
+    }
+}
diff --git a/Marco.Pms.Model/ViewModels/Inventory/RequisitionStatusVM.cs b/Marco.Pms.Model/ViewModels/Inventory/RequisitionStatusVM.cs
new file mode 100644
index 0000000..78d3653
--- /dev/null
+++ b/Marco.Pms.Model/ViewModels/Inventory/RequisitionStatusVM.cs
@@ -0,0 +1,10 @@
+namespace Marco.Pms.Model.ViewModels.Inventory
+{
+    public class RequisitionStatusVM
+    {
+        public Guid Id { get; set; }
+        public string? Name { get; set; }
+        public string? Description { get; set; }
+        public bool IsActive { get; set; }
+    }
+}
diff --git a/Marco.Pms.Services/Service/MasterService.cs b/Marco.Pms.Services/Service/MasterService.cs
index 091ba3c..3503a17 100644
--- a/Marco.Pms.Services/Service/MasterService.cs
+++ b/Marco.Pms.Services/Service/MasterService.cs
@@ -1863,9 +1863,9 @@ namespace Marco.Pms.Services.Service
                 return ApiResponse<object>.ErrorResponse("An error occurred", "Unable to fetch work status list", 500);
             }
         }
-        public async Task<ApiResponse<object>> CreateWorkStatus(CreateWorkStatusMasterDto createWorkStatusDto, Employee loggedInEmployee, Guid tenantId)
+        public async Task<ApiResponse<object>> CreateWorkStatus(CreateWorkStatusMasterDto model, Employee loggedInEmployee, Guid tenantId)
         {
-            _logger.LogInfo("CreateWorkStatus called with Name: {Name}", createWorkStatusDto.Name ?? "");
+            _logger.LogInfo("CreateWorkStatus called with Name: {Name}", model.Name);
 
             try
             {
@@ -1880,19 +1880,19 @@ namespace Marco.Pms.Services.Service
 
                 // Step 2: Check if work status with the same name already exists
                 var existingWorkStatus = await _context.WorkStatusMasters
-                    .FirstOrDefaultAsync(ws => ws.Name == createWorkStatusDto.Name && ws.TenantId == tenantId);
+                    .FirstOrDefaultAsync(ws => ws.Name == model.Name && ws.TenantId == tenantId);
 
                 if (existingWorkStatus != null)
                 {
-                    _logger.LogWarning("Work status already exists: {Name}", createWorkStatusDto.Name ?? "");
+                    _logger.LogWarning("Work status already exists: {Name}", model.Name);
                     return ApiResponse<object>.ErrorResponse("Work status already exists", "Work status already exists", 400);
                 }
 
                 // Step 3: Create new WorkStatusMaster entry
                 var workStatus = new WorkStatusMaster
                 {
-                    Name = createWorkStatusDto.Name?.Trim() ?? "",
-                    Description = createWorkStatusDto.Description?.Trim() ?? "",
+                    Name = model.Name.Trim(),
+                    Description = model.Description.Trim(),
                     IsSystem = false,
                     TenantId = tenantId
                 };
@@ -1909,16 +1909,16 @@ namespace Marco.Pms.Services.Service
                 return ApiResponse<object>.ErrorResponse("An error occurred", "Unable to create work status", 500);
             }
         }
-        public async Task<ApiResponse<object>> UpdateWorkStatus(Guid id, UpdateWorkStatusMasterDto updateWorkStatusDto, Employee loggedInEmployee, Guid tenantId)
+        public async Task<ApiResponse<object>> UpdateWorkStatus(Guid id, UpdateWorkStatusMasterDto model, Employee loggedInEmployee, Guid tenantId)
         {
-            _logger.LogInfo("UpdateWorkStatus called for WorkStatus ID: {Id}, New Name: {Name}", id, updateWorkStatusDto.Name ?? "");
+            _logger.LogInfo("UpdateWorkStatus called for WorkStatus ID: {Id}, New Name: {Name}", id, model.Name);
 
             try
             {
                 // Step 1: Validate input
-                if (id == Guid.Empty || id != updateWorkStatusDto.Id)
+                if (id == Guid.Empty || id != model.Id)
                 {
-                    _logger.LogWarning("Invalid ID provided for update. Route ID: {RouteId}, DTO ID: {DtoId}", id, updateWorkStatusDto.Id);
+                    _logger.LogWarning("Invalid ID provided for update. Route ID: {RouteId}, DTO ID: {DtoId}", id, model.Id);
                     return ApiResponse<object>.ErrorResponse("Invalid data provided", "The provided work status ID is invalid", 400);
                 }
 
@@ -1942,20 +1942,31 @@ namespace Marco.Pms.Services.Service
 
                 // Step 4: Check for duplicate name (optional)
                 var isDuplicate = await _context.WorkStatusMasters
-                    .AnyAsync(ws => ws.Name == updateWorkStatusDto.Name && ws.Id != id && ws.TenantId == tenantId);
+                    .AnyAsync(ws => ws.Name == model.Name.Trim() && ws.Id != id && ws.TenantId == tenantId);
 
                 if (isDuplicate)
                 {
-                    _logger.LogWarning("Duplicate work status name '{Name}' detected during update. ID: {Id}", updateWorkStatusDto.Name ?? "", id);
+                    _logger.LogWarning("Duplicate work status name '{Name}' detected during update. ID: {Id}", model.Name, id);
                     return ApiResponse<object>.ErrorResponse("Work status with the same name already exists", "Duplicate name", 400);
                 }
 
+                // Capture original state for audit log
+                var existingEntityBson = _updateLogHelper.EntityToBsonDocument(workStatus);
+
                 // Step 5: Update fields
-                workStatus.Name = updateWorkStatusDto.Name?.Trim() ?? "";
-                workStatus.Description = updateWorkStatusDto.Description?.Trim() ?? "";
+                workStatus.Name = model.Name.Trim();
+                workStatus.Description = model.Description.Trim();
 
                 await _context.SaveChangesAsync();
 
+                await _updateLogHelper.PushToUpdateLogsAsync(new UpdateLogsObject
+                {
+                    EntityId = workStatus.Id.ToString(),
+                    UpdatedById = loggedInEmployee.Id.ToString(),
+                    OldObject = existingEntityBson,
+                    UpdatedAt = DateTime.UtcNow
+                }, "WorkStatusMasterModificationLog");
+
                 _logger.LogInfo("Work status updated successfully. ID: {Id}", id);
                 return ApiResponse<object>.SuccessResponse(workStatus, "Work status updated successfully", 200);
             }
@@ -2003,10 +2014,21 @@ namespace Marco.Pms.Services.Service
                     );
                 }
 
+                // Capture original state for audit log
+                var existingEntityBson = _updateLogHelper.EntityToBsonDocument(workStatus);
+
                 // Step 5: Delete and persist
                 _context.WorkStatusMasters.Remove(workStatus);
                 await _context.SaveChangesAsync();
 
+                await _updateLogHelper.PushToUpdateLogsAsync(new UpdateLogsObject
+                {
+                    EntityId = workStatus.Id.ToString(),
+                    UpdatedById = loggedInEmployee.Id.ToString(),
+                    OldObject = existingEntityBson,
+                    UpdatedAt = DateTime.UtcNow
+                }, "WorkStatusMasterModificationLog");
+
                 _logger.LogInfo("Work status deleted successfully. Id: {Id}", id);
                 return ApiResponse<object>.SuccessResponse(new { }, "Work status deleted successfully", 200);
             }