You can choose to Manage Inventory of an Item by first checking the Track Inventory field for the Sale Item (see Creating and Modifying Sale Items). To Manage Inventory of an Item, view the Item by clicking on it from either the Sale Items list, or while Managing Available Items for a Location. See Managing Available Items.
Basic Workflow
Click on the Manage Inventory button
Click Manually Adjust for a Location to Add, Subtract, or Transfer Inventory of that Item
To Add Inventory, choose the Add Inventory option from the Actions drop down
To Subtract Inventory, choose the Subtract Inventory option from the Actions drop down
To Transfer Inventory to another Location, choose the Transfer Inventory optionfrom the Actions drop down , and choose the Transfer To Location from the drop down