Outsourcing Check printing to Bank

Hi - We have a requirement where we plan to outsource check printing to a bank. Currently we print checks in house. The idea is that:

1. We would still want to create payment control groups in JDE and then process it, at the end we need to create a flat file of these checks which would then be sent to the bank for check printing.

2.One of the main requirements is the business would like to use the same bank account number but would like different check sequence (one for bank) and another sequence for backup scenarios where they may have to write checks internally in case of emergencies or issues.