Welcome to Gaia!
smile
You shouldn't be experimenting that...given that these inventories are integrated now.
But in any case go to your inventory arranger
(My gaia> inventory> organize inventory> click on house image [right screen] or click the link below) and drag the items you want into the house inventory.
http://www.gaiaonline.com/inventory2/arranger/
Then, go to design your home and you will be able to see them there.