How to Map Shipping Methods with QuickBooks

Go to Integrations > Accounting/POS/ERP > Posting Settings.
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Select Orders on the left, then in the Posting Rules under Configure Mappings click Setup for Map shipping methods.
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Here in Shipment Mappings, you can map the shipping methods from your online store with the shipping methods in QuickBooks.
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You can add new shipping methods by selecting the Carrier from the Select carrier: dropdown and entering the name of the shipping method, select Add New Method, to create a mapping for that method.
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To save the mappings, click Save & Close on the above screen, then Save & Continue on the orders page and close the Posting Settings Window.