lol.. not going to lie i always wondered this myself.
I ended up saving my "prefabs" on a blank map and naming it like "doorway.vmf" when ever i needed it i would load up "doorway.vmf" and copy/paste over.
lol, oye. =)
Thanks for you help! I have another noob question if you don't mind. I inserted a spawnroom prefab into my map, but it has a skybox surrounding it on all sides. The spawnroom is inside a building, so I need to get rid of this, but whenever I select the skybox, it selects the entire spawnroom as well. How do I select the skybox by itself?
There is a button for that in hammer. It "ungroups". It's somewhere on the toolbar. I believe it's blue??? I don't know, I just know which one to click. Just hover over the buttons and you will see an ungroup button
edit: too late