How do I unlink or un-associate the mandatory requirement of class for all Balance sheet accounts?

Good day, 

Let me help you by making sure you'll be able to remove the assigned class to transactions in QuickBooks Online (QBO).

Removing the assigned class from a transaction is pretty easy. You'll want to open the transaction one at a time, then delete the class from there.

Here's how:

1. Find and open the transaction.
2. From the Class field, highlight the class name, then press the Delete key on your keyboard.
3. Click Save.

I've attached a screenshot for your reference. 

You can also browse these articles to learn more about managing your reports:

• Run reports by class
• Filter, sort, or total reports by Class.
• Customize reports in QuickBooks Online

 Let me know if there's anything else you need help with managing transactions with class. I'm always here to help. Take care and keep safe!