If you don't want or need inventory tracking in QuickBooks, then you can use a non-inventory item for all of your SKUs.

Make a non-inventory item in QuickBooks Online for all of your Amazon inventory. Give it a descriptive name like Amazon US SKUs. 

Then map that non-inventory item in SellerZen. We'll use this non-inventory item for all of your invoices.

Make sure to click on Save.

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