Quantity Adjustments allow you to manually adjust Inventory's Quantity On Hand per warehouse.
Navigate to 'Inventory' > 'Processing' > 'Qty Adjustments'.
To create a new 'Qty Adjustment', press the 'New Inventory Adjustment' button at the top-left of the screen. 
Under the 'General' tab on the 'Details' panel, first select a Branch.
On the 'Lines' panel, select the Inventory Item and Warehouse which you wish to adjust. 'Qty In' will add the stock to the warehouse and 'Qty Out' will take it out.
The above example will add 50 units of BAG001 to the JHB Consumables warehouse.
Click the 'Post Adjustment To Financial System' button to complete the Adjustment. 