Hello leanne-farrell-t,
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!