You can assign an expense account for each vendor in advance by using the Vendor-Payee Mapping section in Settings.
In the Record to Accounting section, clicking on the “Edit” button will open a panel to the right as shown below.
Simply select an expense account from the drop down list to assign it to the vendor. As with all drop down lists of accounts, this one is populated from the chart of accounts in your connected QuickBooks Online account.
Once an account is assigned (mapped), the system will populate the
Note: If the vendor involved in the transaction does not exist in QuickBooks Online, the system will automatically create it the using payee information.