In QuickBooks Online, you can assign a default expense category for a supplier when setting them up in QuickBooks Online. Here's how to assign the category in the supplier details.
Click on the Expenses tab and choose Suppliers.
Locate and click the supplier's name.
Click on Edit.
Scroll down and locate the Default expense category.
Click on Save.
Once done, create a dummy bill or expense to see the default category assigned for this supplier.
Post again in the Community if you have further concerns. Have a great day!
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