There is a built in feature @Darkangel which CSL included in one of their updates with Natural Disasters and Mass Transit dlcs that allows you to import sub buildings. The one you linked is useful for creators that create large assets with heavy tris This is useful for making services which release helicopters and vehicles. The mod you linked allows the possibility to view stats for both buildings. It is not the feauture itself which imports the building. Building as it stands should not have choppers landing front centre. Does it? By default those who do not use the marker will have helicopters landing front centre unfortunately.

http://steamcommunity.com/sharedfiles/filedetails/?id=608517757 sub buildings tab still works what mod are you talking about that cs swallowed up? Yes helicopters do go at teh front centre of teh ground so if you can get them to land on helipad that would be good but it would also be nice if they actually spawned from that spot too.

You do not need the substation mod for this to work. This one has a small 1x1 Detached home at the base which acts as the hospital that releases ambulances, and saved as a Helicopter Depot to release helicopters. This one does both and no SubBuilding mod is required as CS has swallowed that mod.

So helicopters actually spawn from this building as well as ambulances. I presume you need the substation mod for this to work (& of couse naturarl disasters).?