My understanding is that Square is unable to sync changes in inventory with QBO. How then do you recommend handling/correcting inventory in QBO?

We enjoy having you here in the Community, @heidipav.

You’ve reached the right place and I’ll be able to show you how to edit inventory.

Let me guide you how:

1. Select the Search icon.
2. Choose Advanced Search.
3. From the All Transactions drop-down menu, pick Inventory Quantity Adjustment.
4. Click the appropriate filters from the different drop-down menus, then locate Search.
5. Find the adjustment you want to change.
6. Change the Adjustment date and the Inventory adjustment account if necessary.
7. If you need to add inventory items, enter the details in the New adjustments section.
8. Or to make changes to the previous adjustment, edit the details in the Previous adjustments section.
9. Go to Save and close.

If there are additional questions or concerns, let me know.

@heidipav 

Afaik, Square Inventory is the inventory management module only to integrate with other Square product (e.g Square Invoice, SquareSpace) at the moment. Consider using another inventory management app supporting QBO.

If you opt to use Square Inventory, you have to migrate the data as inventory adjustment into QBO by an importer tool.