How can I add classes on my Quickbooks Plus license?

Hello vat@al-tax.xo.uk, Welcome, and thanks for posting on the Quickbooks Community page, if the option for classes is not showing up in all lists, it is probably due to the setting for classes not being turned on. To check this is if you go to main cog wheel> account and settings> advanced>categories>track classes> save > click the bog x top right then go back to cog wheel> all lists and classes should now show up in the list for you on the right-hand side column around the third one down. Please do reach out to us if you still have an issue of not being able to see classes in the all-list section and we will be happy to look into it more for you. Otherwise, have a lovely afternoon.