Hello there, BonnieBorn and Voiceness.

Thank you for joining this thread. Allow me to step in and provide more details about converting non-inventory item to inventory item.

In QuickBooks, you can't convert an inventory item to a non-inventory item or vice versa. As a suggestion, you can deactivate the non-inventory item and create a new one with the correct type.

Here's how to deactivate an item:

1. Click Lists.
2. Choose Item List.
3. Highlight the item.
4. Right-click on your mouse, choose Make Item Inactive.

After that, follow this steps in adding an inventory item:

1. On the same screen, right-click on your mouse.
2. Choose New.
3. Choose Inventory Part.
4. Enter the necessary information.
5. Click OK to save.

For in-depth information, you can use this article as a reference: Add, edit, and delete items. After correcting your items' information, you can already select them when creating transactions which will update your reporting.

Let me know if you have follow up questions about the inventory feature in QuickBooks Desktop. I'd be around to help you more. Have a wonderful day ahead!