Accounts Payable Merging of 2 Vendor Groups

I've got two companies that are going to merge and I've got both of them in AP as two separate vendor groups. They currently have separate bank accounts, separate check numbering systems, separate vendors, etc. They will soon be sharing a bank account and checks when they merge but they will still enter invoices and other data separately, while coordinating on the check numbers.

There doesn't seem to be any precedent for this. Infor has nothing to offer with regard to this and I didn't see any thing on the forums here that match this scenario. Is it possible to merge AP vendors, distributions, ACH's, etc. minus any check history? Should I even be asking this question? Does anyone have any experience with this sort of thing and if so, what did you do? Any ideas would be greatly appreciated!