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Yes. Being part of a GDG only affects the name of the dataset created.

You "REDEFINES" the field to allow you to reference the right-most digit. If that is 1, 3, 5, 7, 9, it is odd, else it is even.

Why do you want to SORT the data which is already in the order you want?

Look at OUTFIL reporting features: REMOVECC, SECTIONS with TRAILER3 using TOT/TOTAL. You can format the data in many ways like that.

As well as sucking-up resources and consolidating data, SUM has no options for formatting.

What do you mean by "JCL"? Just those lines that start "//" in column one? Nope, can't be done. You presumably have a PS/flat file? How do you think you'd delete records from there? Nope, can't be done. Of course, with SORT or another programming language and by creating a new output file with only ...

Use MERGE with SORTIN01 and SORTIN01. OPTION EQUALS, and use a generated sequence number for the fake key for the MERGE. Remember to drop the fake bit in OUTREC or OUTFIL.

AT END/NOT AT END are slovenly to use. Use the FILE STATUS on the SELECT and test that field.
Do that as an evaluate. Or do exactly what I said earlier.

Take a "normal" program which processes header, details and trailer. In the "process details" simply write the record out. Remembering that I assume you count the records anyway.

That's just SPAM.

012C. The sign is an "overpunch", embedded in the value. Consult the Enterprise COBOL Programming Guide for details

The question does not make much sense. The VALUE clause on WS-C is invalid, you can't have a VALUE clause on a REDEFINES or an item subordinate to the REDEFINES.

WS-B will be unchanged. WS-A will be 88.10. If the total which would otherwise be in WS-A was greater than 99.99, then the ON SIZE ERROR would be actioned.

Output would be "MUxxx123xxx00000", where x is some random value (or perhaps binary zeros, it depends). The INITIALIZE will not affect FILLER items - unless you already have Enterprise COBOL V6.1, which you don't, since it was only announced last week. This has an extended (COBOL 2014 Standard) synt...

Well, HP do not make Mainframes. IBM does. KSAM might be "nothing but indexed" but I don't know anything about it. Plus only you can see the code in it. Apart from a pornographic spammer and myself, there is no-one active on this site. So contact your site support (if you have such a thing), colleag...

You have a site-specific program. You have to look at that. What is KSAM? Are you even using a Mainframe?

If you just display a screen, what is the user going to do?