Created by TTTC!!!!!!!!!! Do you want to make those boxes, chairs, barrels and those stuff that you can move but they dont apper on your map or you cant move them? I will explain how you can make them move.
1) Make a normal room with a light and a player spawn!
2) Make a prop_physics.
3) On the World Model keyvalue click Browse... and find the model you want!
4) Place it where you want it to be!
NOTE: All models arent prop_physics such as NPCs, doors, fences. If they dont appear in your map its not a prop_physics.