Yeah, IGYWCLG is the old way, it's never really used anymore
Wherever did you get this idea - it is completely wrong. . . It also has nothing to do with either VSAM or VTAM. This is for a COBOL compile, link, and "go".
Why would you suggest deleting a sys1 dataset?
Why would you believe everything should be tcp/ip now? Rest assured, vtam is very alive.
It is understandable that the TS (Topic Starter) is new and has many questions/misconceptions. The people providing solutions/suggestions should not "just throw things in". . .
We are waiting for the requirement to be clarified. . . Then we should be able to properly reply.