diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
index 4b5b661..76a645a 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
@@ -67,12 +67,18 @@ const InventoryItem* Controller::getInventoryItem(const std::string& inventoryIt
 
 void Controller::addInventoryItem(const std::string& partName, int quantity, double price)
 {
+    m_inventoryManagementService.addInventoryItem(partName, quantity, price);
 }
 
 void Controller::removeInventoryItem(const std::string& inventoryItemID)
 {
 }
 
+void Controller::addInventoryItemStock(const std::string& selectedItemId, int quantity)
+{
+    m_inventoryManagementService.addInventoryItemStock(selectedItemId, quantity);
+}
+
 util::Map<std::string, const ServiceBooking*> Controller::getServiceBookings()
 {
     return util::Map<std::string, const ServiceBooking*>();
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
index a06695a..1d849de 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
@@ -50,5 +50,6 @@ public:
     util::Vector<const Notification*> getNotifications();
     void deleteNotification(const std::string& notificationID);
     void configureNotifications(const std::string& userID, bool paymentNotifications, bool serviceNotifications);
+    void addInventoryItemStock(const std::string& selectedItemId, int quantity);
     void runSystemChecks();
 };
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.cpp
index 3e0a872..714d7c5 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.cpp
@@ -1,4 +1,26 @@
 #include "InventoryManagementService.h"
+#include "InventoryItem.h"
+#include "Factory.h"
+
+void InventoryManagementService::addInventoryItem(const std::string& partName, int quantity, double price)
+{
+    InventoryItem* newItem = Factory::getObject<InventoryItem>(partName, quantity, price);
+    m_dataStore.getInventoryItems().insert(newItem->getId(), newItem);
+}
+
+void InventoryManagementService::addInventoryItemStock(const std::string& selectedItemId, int quantity)
+{
+    int index = m_dataStore.getInventoryItems().find(selectedItemId);
+    if (index != -1)
+    {
+        InventoryItem* item = m_dataStore.getInventoryItems().getValueAt(index);
+        if (item != nullptr)
+        {
+            int totalQuantity = item->getQuantity() + quantity;
+            item->setQuantity(totalQuantity);
+        }
+    }
+}
 
 util::Map<std::string, InventoryItem*> InventoryManagementService::getInventoryItems()
 {
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.h
index 099b964..c27ba64 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.h
@@ -17,6 +17,7 @@ public:
     InventoryItem* getInventoryItem(const std::string& inventoryItemID);
     void addInventoryItem(const std::string& partName, int quantity, double price);
     void removeInventoryItem(const std::string& inventoryItemID);
+    void addInventoryItemStock(const std::string& selectedItemId, int quantity);
     void sendLowStockAlerts();
     void sendNotification(User* user, const std::string& title, const std::string& message) override;
     void attach(User* user) override;
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp
index aad212a..1adf7bc 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp
@@ -3,6 +3,7 @@
 #include "InventoryItem.h"
 #include "InputHelper.h"
 #include "OutputHelper.h"
+#include "InventoryItem.h"
 
 void AdminMenu::showMenu()
 {
@@ -67,8 +68,118 @@ void AdminMenu::viewStockLevels()
 	}
 }
 
+static util::Map<std::string, const InventoryItem*>
+filterActiveItems(const util::Map<std::string, const InventoryItem*>& inventoryItems)
+{
+    util::Map<std::string, const InventoryItem*> activeItems;
+    int inventorySize = inventoryItems.getSize();
+    for (int index = 0; index < inventorySize; index++)
+    {
+        const InventoryItem* item = inventoryItems.getValueAt(index);
+        if (item != nullptr && item->getState() != util::State::INACTIVE)
+        {
+            activeItems.insert(item->getId(), item);
+        }
+    }
+    return activeItems;
+}
+
+static void displayInventoryWithItems(util::Map<std::string, const InventoryItem*>& inventoryItems)
+{
+    int inventorySize = inventoryItems.getSize();
+    std::cout << std::left << std::setw(10) << "Index"
+        << std::setw(15) << "Item ID"
+        << std::setw(25) << "Part Name"
+        << std::setw(10) << "Quantity"
+        << std::setw(10) << "Price"
+        << std::endl;
+    for (int iterator = 0; iterator < inventorySize; iterator++)
+    {
+        const InventoryItem* item = inventoryItems.getValueAt(iterator);
+        if (item != nullptr)
+        {
+            std::cout << std::left << std::setw(10) << (iterator + 1)
+                << std::setw(15) << item->getId()
+                << std::setw(25) << item->getPartName()
+                << std::setw(10) << item->getQuantity()
+                << std::setw(10) << item->getPrice()
+                << std::endl;
+        }
+    }
+}
+
+static void addQuantityToItem(util::Map<std::string, const InventoryItem*>& inventoryItems, Controller& m_controller)
+{
+    int itemIndex;
+    int quantity;
+    auto activeItems = filterActiveItems(inventoryItems);
+    int activeSize = activeItems.getSize();
+    if (activeSize == 0)
+    {
+        std::cout << "No active items available in Inventory" << std::endl;
+        return;
+    }
+    displayInventoryWithItems(activeItems);
+    std::cout << "Enter the index of the item to update: ";
+    util::read(itemIndex);
+    if (itemIndex < 1 || itemIndex > activeSize)
+    {
+        std::cout << "Invalid index selected." << std::endl;
+        return;
+    }
+    std::cout << "Enter quantity to add: ";
+    util::read(quantity);
+    if (quantity < 0)
+    {
+        std::cout << "The quantity should be Greater than 0." << std::endl;
+        return;
+    }
+    const InventoryItem* selectedItem = activeItems.getValueAt(itemIndex - 1);
+    if (selectedItem != nullptr)
+    {
+        std::string selectedItemId = selectedItem->getId();
+        m_controller.addInventoryItemStock(selectedItemId, quantity);
+        std::cout << "Updated " << selectedItem->getPartName()
+            << " stock. New quantity: " << selectedItem->getQuantity()
+            << std::endl;
+    }
+    else
+    {
+        std::cout << "Error: Selected item could not be found." << std::endl;
+    }
+}
+
 void AdminMenu::addInventoryItem()
 {
+	util::clear();
+	int choice, quantity;
+	double price;
+	std::string partName;
+	std::cout << "1. Add new item \n2. Add Quantity\nEnter your choice : ";
+	util::read(choice);
+	switch (choice)
+	{
+	case 1: 
+	{
+		std::cout << "--------Enter Item Details----------\n";
+		std::cout << "Part Name : ";
+		util::read(partName);
+		std::cout << "Quantity : ";
+		util::read(quantity);
+		std::cout << "Price : ";
+		util::read(price);
+		m_controller.addInventoryItem(partName, quantity, price);
+		std::cout << "New Item " << partName << " added to the Inventory.\n";
+		break;
+	}
+	case 2:
+	{
+		auto inventoryItems = m_controller.getInventoryItems();
+		addQuantityToItem(inventoryItems, m_controller);
+		break;
+	}
+	}
+	util::pressEnter();
 }
 
 void AdminMenu::removeInventoryItem()