Hello, Marcia,
I agree that you are not seeing automatic Inter-Branch balancing transactions because your branches are set up not requiring them to balance.
I guess you are saying that you tried to change the setting in a test copy of your tenant and the setting cannot be changed (though it looks editable in your screen shot).
If you print the GL Trial Balance Report one company at a time, do Assets match Liabilities when printing with Sign of Trial Balance set to Normal in GL Preferences? Or does the report foot to $0 if you print it with Sign of Trial Balance set to Reversed, for every month of the past 4 years?
If every month is in balance by branch (even though your settings weren’t requiring it), then Acumatica “may” be able to help you change the setting. First, enter journals to balance every single month of history - if they don’t already balance by company. Work with your CPA to make sure your changes to balance by company have no impact on tax reporting, etc.
Then open an Acumatica support ticket through your partner/VAR, and ask for help.
Laura