Is there any functionality to transfer open AP vouchers from one business to another?

We have AP business unit with single book ledger and would like to start using multi-book ledgers with new ledger as primary ledger.

If we decide to create new AP BU where transactions will go to GL BU with milti-books enabled.  Is there any process that we could move open invoices from old AP BU to new AP BU?  Open invoices including those entered and posted but not paid or partially paid.

If no process then I'm thinking of getting list of existing vouchers in old BU and create them as new vouchers in new AP BU.  Accounting entries from new vouchers will be reversed out of those transdactions already hit GL from the old BU.