Copying Areas Rather Than Rooms

I'm currently working on a build that has a lot of areas that are either identical to each other or are mirrored versions of each other. One thing I realized would be handy would be the ability to select multiple objects, either through some version of key command + clicking or through being able to drag and highlight an area, and then copy just that set of objects.

This would differ from copying a room in being able to, for example, copy just a bed+nightstand+lamp+rug+clutter combo all at once, or out of doors copy a tree+flowers+fountain+chairs+bushes+clutter combo. Unless I'm missing something, right now you have to either copy an entire room, or copy each item one-by-one, and that can slow down a large build dramatically. :(