Just to make this easy to understand i'll make up a fake scenario. Units spawn 1 at a time from Location A when Player 1 owns a Marine. Units spawn 2 at a time from Location A when Player 1 owns a Firebat. Units spawn 3 at a time from Location A when Player 1 owns a Ghost.
For the triggers, instead of setting the trigger to this and having to change it for every unit:
-Player 1
-Commands 1 Marine at Location B
-Create one zergling at Location Afor Player 2
Preserve Trigger
-Player 1
-Commands 1 Firebat at Location B
-Create one zergling at Location A for Player 2
Preserve Trigger
etc...
Can I skip this three step process and simply have the fact of owning a Marine, Firebat or Ghost multiply units? Probably not i'm just wondering because it'd save me a bunch of time, thanks!