Good afternoon, Verkistconstruct.
I'd be happy to assist you in undoing today's actions, however, in order to help you with that process, I will need more detail.
What exactly did you do that you want undone? Run payroll? Reconciliation?
If its reconciliation, I've provided you with a link that shows you how to reconcile an account.
Hope this helps and if you need anything else, I'm just a few clicks away.