I want to change some of my classes for this next FY. Do I change them now or wait until I've closed last FY books? Will it affect last year's reports?

I've got your back, @bray-wlgbc-com.

If you wish to change some of your classes for the next FY, you can do it once you close your last FY books. This way, it will not affect your previous year's reports.

To change the parent and sub classes, you can edit them manually in the Settings menu. For detailed steps, you can utilize this link for your reference: Create and manage classes in QuickBooks Online.

In addition to that, I've attached some related articles you can use to track and set up classes in QuickBooks Online:

• Get started with class tracking
• Track your transactions by class

You can always reach out to me if you have further concern about managing and tracking classes in QuickBooks. I’m more than happy to help. Have a fantastic day!