After grinding away at some very tedious ground battles and airfields one object at a time I suddenly was reminded that we have the ABILITY TO SELECT AND MOVE GROUPS OF OBJECTS!!!! Ca't believe I'd not used it after years of wanting it.
Anyway, selecting, cutting, pasting, etc is easy enough but I can't rotate them yet. What's the (no doubt very simple) method? Only started playing with these functions a few minutes ago.