I can't figure out how to add system items to units. For example: I have an overlord but I want it to start with a bunker upgrade, how can I make sure the overlord has a bunker upgrade on it? And how can I then put infantry inside, using scripts?

ty

you can only build the upgrade manually and load the units manually into another.

i have attached a test map with a working overload bunker upgrade and units that are loaded into it.   overlord bunker test.zip (3kb) downloaded 5 time(s).