what is the function stpapi.handle.subproc("tfgld1101m100", "tfcmg2100s000", "add") to do?

This is the correct forum. To me this command tells the main session that the subsession is going to be activited and control passed to the subsession. Then the subsession is controlled by direct use with stpapi commands. When the subsession is ended control is passed back to the main session.

Please stop posting questions with titles like "please help" or "need help". It is in your own interest to formulate proper titles to your posts/questions.