This may have been suggested, but as far as I know there’s no way to group items together in condo so that they “stick together” so to speak. This would make it a lot easier to scale, duplicate and move things you want to be together. For example, if I had a bookshelf in my condo which had books and trophies on it, I’d have to move and scale the shelf, books and trophies individually if I wanted. Grouping items into one would help ease this. Even better, being able to save these item groups as presets would be very handy, which could then be duplicated, assuming you have all of the items in the group in your inventory.
This is already planned as far as I know.
I think multi-selection will more or less accomplish what you’re talking about.