Need some guidance on how to modify the seeded Generic EDIFACT PAYMUL Payment Format.

My Org is implementing a new Payment Method with a Bank in EBS Payables. We need to generate a Payment Instruction File (PIF) in the format provided by the Bank. It is a variable length .CSV file with some header, detail and trailer records.

I'm trying to use the seeded Generic EDIFACT PAYMUL Payment Format template to modify it to the .csv output.

Am I on the right track? If so, how do I modify IBYDE_PYML_en.rtf to suit the requirement?

Are there any documented examples to do this?

Kindly advise.