[Map] How do I organize Maps/Folders in Advanced map?

[Forever Alone]

Say I want to move the Pokémon center map rooms from one route to another instead of having to spend time looking for that specific route that contains the Pokécenter sub maps in it. How would I do that for convenient sake, It's hard trying to figure out which houses I haven't used for either deletion or remodelling.
Also as a side question about the Pokécenter, when placing one in a route how to I get the flying position working for it? In Kanto there are 2 routes with a Pokécenter, can I just copy the hex from them or something instead of writing a new one?
Thanks!