Vendors with zero balance on A/P Aging summary
How do you get a vendor with a zero balance off your AP Aging summary?
How do you get a vendor with a zero balance off your AP Aging summary?

Go into the Receive Payments screen and apply the outstanding credits against the outstanding balance. Date the transaction on the later of the invoice date or the credit date.
Not sure I understand the answer. These are vendors that we have paid off but are still on our list?? There is no outstanding credit or balance.

There is an outstanding credit, and an outstanding balance, and they exactly offset each other, and fall into the same aging period.
Just try it, and see if it works. I've done it a couple hundred times for various clients, and it's always worked for me.