Rederive PO Charge account with backing REQ

Summary

Hi, Is there an option on re-deriving the PO change account with backing REQ during PO auto creation process?

Content

We are want to default employee department during REQ creation / approvals process but want to override it with default department during PO auto created from REQ. (touchless process)

Is there any option to trigger separate TAD rules during touchless PO creation process as well?