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I searched through all help documentations provided by PSS\E and tried to read everything related to subsystem carefully in hope that I can find the answer to my above posted question. Unfortunately NO answer so far available to me.

However, to resolve my own problem, I have a workaround solution that could serve my need perfectly without resolving the correspondence problem between a subsystem label (created in GUI) and subsystem ID (created in API).

My task is that I would like to define a subsystem (of course not the whole working case) description file in GUI that will be used later in Python to form a DFAX file and eventually to run ACCC. However, when I want to use some subsystem data retrieval APIs to fetch the network details about branch, buses and machines in my previously define subsystem in GUI which only has a subsystem label, those data retrieval APIs force me to provide the corresponding subsystem ID, which I don't have and don't know an existing API that can assign one.

Workaround solution: Let's say I want to define subsystem based on the areas in the network, then

I just need to make sure I include the same areas as the predefined subsystem I defined through GUI as my subsystem when I define subsystem (note that this subsystem is just a conceptual subsystem copy I used to refer the subsystem defined GUI to make sure I am fetching the correct subsystem network information) using API.

I hope I made myself clear on this issue. I wish this will of some help to those who might wonder the same question as I did.