Holy christ your answers to me today are on point and well versed.
I will give this a try, as macros aren't something I've played with but I have a question: does hiding a unit simply render it invisible, or does it actually remove the unit from the map? The reason I ask is, if my External Unit is a ground-based ranged Marine and he is following his host in the Dropship, if he is simply invisible wouldn't he still attack/be attacked by other units?
I have a carrier-type unit that keeps it's units External (instead of "inside" the unit) The issue is when the Carrier unit is loaded into another unit (a dropship), the Externally created units just stay on the map and will follow the dropship.
What is the easiest way to kill off the External units when the main Host unit is in a load/unload cargo?