Hi there, @SSWap5922.
Yes, it's possible to merge multiple A/P account in QuickBooks Online.
Normally, the transactions after merging an account will be moved into the register of the one you wish to keep. Thus. it'll accumulate the total balance of all your transactions from the older and the newer account.
You can also check this link for the complete guidelines: Merge duplicate accounts, customers, and vendors in QuickBooks Online. If you don't wish to merge them, you can delete the unwanted A/P account.
When everything is in place, you can utilize this article for future reference: Reconcile an account in QuickBooks Online. This link can walk you through the steps in matching your accounts effectively.
In case you have other concerns or questions in supervising your accounts, tag me in your reply. I’d be more than happy to work with you again.
