Can I match an item in inventory to an existing sale?

If you are on the Ultimate plan, you can do this with the following steps:

1. Select sales by clicking the checkbox on the far left (if you've hidden the id column, you'll need to unhide it)
2. Match these sales by clicking the "Match to Inventory" button

For Basic and Premium users, once a sale has been recorded, you can't match it to an inventory item after the fact. Best thing to do would be delete the sale, then click "Report Sale" and enter the sale details. The first field on this form is "Item Title", when you start typing, it will search inventory for a matching item. If you click on the correct inventory item, it will select that item for the sale. When you click the "Add" button, the sale will be recorded and the inventory will be removed from the current inventory list.