How do you add classes when posting a journal.I have already set the classes up

It's good to see you here in the Community, @jp-bournerbulloc.

Allow me to fill you in on everything you need to know about class tracking in QuickBooks Online (QBO).

Once the Class tracking feature is turned on, you'll see a Class field on the right side of the transaction's (Journal) page where you can add a class. I'll add a screenshot below for your visual reference.

However, if you haven't seen class fields on your Journal Entry page, let's log in to your QBO account via a private browser. It's possible that the browser you're using had a data issue, thus causing QuickBooks to act weirdly. To do so, press this shortcut key on your keyboard:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P

If this works, it means that you need to clear the browser's cache so the system can start fresh. If you get the same result while using a private browser, I recommend switching to a different one.

Please let us know how it goes, @jp-bournerbulloc. The Community and I want to make sure you're taken care of.

You may also want to run reports by class in QBO. This will help you keep a close eye on each segment in your business.

Thanks for coming to the Community, wishing you continued success.