Hi there, @Robyn261. I've got the information you're looking for about assigning classes to accounts.

The option to assign classes to accounts is only available in QuickBooks Desktop Enterprise. In the meantime, you may follow the workarounds provided by @ReyJohn_D.

Additionally, this write-up contains further information about managing the Chart of Accounts: Understanding chart of accounts in QuickBooks.

Feel free to come back here again if you need more help using the Class Tracking feature. I'm always available here to help. Have a good one.