It would be useful, but I'm not aware of a way. Hopefully someone will enlighten us.
Someone said in another thread that the core units have asterisks (*) in their names, but I believe that's usually the convention to indicate historical individuals/units? The campaign designer could add a C (or sumfink) after core unit names, but I think they already have enough to do. Perhaps in future 'the code' could do something like this?