As long as you don't create any entries in CM feel free to change the opening balance and ending balance as you need to flush out the old stuff in the reconcile bank function. Give your self permission to over ride in CM settings.  Pick a date you want to clear from like 12/31/19. Depending on how many transactions you need to clear you can probably do just a few of reconcile bank sessions to flush it out. For example use a  12/31/2017 to clear up 2017, 12/31/2018 to clear up to 2018, then use 12/31/2019 to clear the rest. or do one every 3 to 6 months if you have a large dataset.  Reconcile bank can only handle some many transactions at a time but still it can handle a lot.   You may still need to turn on audit trails to reset the balances under "setup banks" window when you are finished. Backup first of course.  Hope this helps!

Great answer!  Your directions work perfect.  Thank you

Glad to help!