When you push a purchase order from Inventory Planner to Quickbooks Online, Inventory Planner creates an identical PO with the same products, quantities, cost that you see on the PO dashboard side. 

Before saving a PO you need to make sure that all products are created in QB. Otherwise you will get an error - Inventory Planner doesn't create products in QB automatically.

Note that this integration works with Quickbooks Online, but not Quickbooks Desktop.

Go to Account > Settings > Purchase Orders and you can enable saving POs to Quickbooks.

Then after you've created a new purchase order, you'll see the option to Save to Quickbooks.

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