Yes. It is not too dificult. there are two ways of doing things:
1.do as you said and put his map files in your folder.then in your build game settings you can choose which fpm files to use in what order and from where.
or...
2. you could save one of your files (prefersably indoor because it has less entities) as a prefab and attach it to another map so you could have a clean transition without there being a seperation of levels between them. who wants a level change and a loading screen every time you walk out a door- am i right?
I hope i helped you some. -Xilith117