Hi.
I made a Rexx for a porting from one z/os to another some year ago and I've
separated each piece of jcl to manipulate and reconstruct a new jcl with
new rule because in old installation we had both procs/proc-pend and
standard jcl and in the new installation we had to convert all in PROC
format and separate main jcl from proc ( 3k object, procs, source, instream
data etc).
With that Rexx and all component divided I found a way to compact each
recursive process(steps) to make centralized proc.

It's complicated but it works and needs to be checked i.e. for scheduler
variables that are not always stored in jcl(like dcb information, gdg limit
and so on...)
At the end it produce an excel with old form and new form(for syntax and
naming convention)
It was a great job... :-) except for LE and DFSORT defaults that were
different...

For that experience I can say that the best is working with rexx and smf to
do what you need, not jes 3(imo, cause I don't know well).
Regards.

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