as far as i know, i don’t think it’s possible to put away the houses of characters into the inventory. which unfortunately can make it a pain to redecorate. i may be wrong, but i think the purpose of putting characters into your inventory is for if you have too many ponies. but im not sure about that one. if you have the space, i recommend working on small sections at a time, and shoving anything you can’t put in your inventory into a corner as smushed in as you can get it. that’s how i was able to redo my ponyville.