1.  A quantity limit can be placed on the add-on items.

2.  To view and edit the quantity available, go to the auction page editor.

3.  Click on the Auction Setup tab and then the Add-ons tab.

4.  The add-ons items and the current quantity can be viewed on the grid.

5.  Next to the item, click on the edit icon to change the quantity.

6.  Edit the Quantity as desired and click on the blue Update button to save the changes.