Hi there, @usernelson-mascarenh.
Usage limits may vary on your QuickBooks Online (QBO) subscription. Let me provide the number of classes you can create depending on your subscription.
If you're using the QBO Simple Start and Essentials versions, the option to create classes isn't available for this subscription. However, if you subscribe to the QBO Plus version, you can set up 40 combined classes and locations. And also, with QBO Advanced version, there's no limitation on creating them.
I'm adding this article to know more about the limits of what your QBO account can handle: QuickBooks Online file size and feature limits.
Just in case you need further help with creating and managing classes in QBO, feel free to read this article for more guidance: Create and manage classes in QuickBooks Online.
Please know that I'm just a reply away if you need any further assistance setting up classes. Have a good one.
