Do I need to copy files to FAKE.USA.ITT.SOURCE.DATA.GDG?
If not, what should I do?
This is a question that can only be answered at your site
. This is an issue of system design, and systems can be designed in multiple ways. Depending upon your system and its design, the answer could be -- yes copy files -- or no, don't copy files -- or, get more information to make that decision.
If the decision AT YOUR SITE is to copy the files, you'll need to decide if they need to be copied, member by member, from the PDS into separate generations of the GDG or if all the members can be concatenated into a copy to a single generation of the GDG. Again, this is a system design issue and not something to be answered except by technical experts at your site.
Further, if this work is for a customer, you may find that the customer has some specific requirements that must be met -- yet another system design issue.