If by 'too complex' you mean 'without opening CivEdit', then, no, not that I know of. You can only 'import' entire sets of units (as in, all the units in a given .biq) between scenarios using CivEdit's file->import command. You'd have to manually copy every attribute of the given unit from one scenario to another, I think. Which isn't difficult at all, if you ask me. CivEdit is very self-explanatory, and if thats not good enough for you theres help for everything.