I think what might be confusing you a bit is the two menus, figure and body parts. OK, you loaded the villa, from the props menu you should see the name of the prop. Under the figure menu there should be nothing. Now when you load Hiro it will show up under the figure menu and the villa will still be listed under the body parts but it should not be parented to Hiro. If it was,move Hiro and the villa will move with him.

I must remember to remember what it was I had to remember.