Thanks for adding a screenshot, @giannibyte.

Let me share some insights why this option isn't available with your QuickBooks version.

The Assign classes to option can be seen in the QuickBooks Desktop Enterprise version. You're correct in what you have said earlier. QuickBooks Desktop Pro and Premier versions don't have this ability.

For more information about class tracking, take a look at this article: How to use class tracking in QuickBooks. It includes screenshots for better interpretation.

I've added a resource for more details: Track your transactions by class. This includes assigning class to a bank entry that doesn't have a match in QuickBooks.

Please let me know if you have other concerns about class tracking. We're always delighted to help you out. Take care.