RPG-to-Cobol conversion (AS400)

I have 5 RPG programs I need to convert to Cobol/400. As a first step I would need to understand the functionality/logic of each program. You could either write up a document like programming specs, or if you are more comfortable directly translating the code into a Cobol program, that would be fine too. I could continue from there, and don't expect you to run the program itself, there are a number of dependencies like DB files so it can't be run stand-alone. My RPG is very basic and all of my experience has been in Cobol/400. I do not have any documentation and don't know the precise functional business logic perspective, but hopefully together we could eventually figure it out and re-engineer the program. I will send you a copy of the largest and seemingly most complex program, you can check it out and let me know what you think and how you prefer for us to work together. Thank you