How do I manually mark items as sold?
Click the
'Manage Inventory' link under the
'Inventory' heading in the control panel menu.

Step Two: Find the item you wish to edit
Use
'Find by ID' or
'Keyword Search' textbox to find the Item. (Or you can use '
filter' icon next to keyword search textbox for '
Advanced Search')

Step Three: Reduce item quantity
Click '-' minus button in the 'Quantity' column in selected item. The quantity of the item will immediately be reduced by 1.