Parent Map/Level

Is there a way to create a parent map/level and have all levels under that update from the default one?

So the game is in a city and has multiple levels. Instead of adding a mailbox or bus stop 35 times to 35 different levels, is there a way i can update the parent or default map & have all other levels update?

I initially was just building 1 level and was going to duplicate that, but as more updates comes, i see myself having to go in & updating every level.

Any help is greatly appreciated!