I am really confused as how to make the aperture science elevator thing with the sliding doors, the one at the end of each test chamber. How do you make it in hammer?

Have you looked at the sample map?

Or the Wiki?

I suggest you to use one of Aldez's prefabs. The prefab looks exactly as in the example map and is perfectly aligned so you don't get mad when trying to align everything.
Others: I know, I know, prefabs bring pain but the aperture elevator is one of those things where it is desirable to use a prefab.

How do you use prefabs though? I have downloaded aldez's prefab pack but i don't know how to use it, because i can import it into the map but when i go into outputs there is red text everywhere and it won't let me edit the outputs.

You must edit the outputs to match your map. I thought that was clear (applies to most other prefabs too)

Thankyou ever so much! I have figured it out how to work the elevator prefab and I looked on the wiki and made one myself for the hell of it. Both worked Also, i am thinking of releasing a map-pack soon... I have been wondering this... if you have two maps you've made, is it possible to link them together, e.g. the aperture science test chambers. when you enter the lift it rumbles and then the loading sign appears. then you are in a different map. Is it possible to do this in hammer?

Of course it is, there is a special entity for it (target_changelevel?) but I don't remember its exact name now.

Wouldn't a point_clientcommand work?

I don't know much about that entity, but it sounds like giving it the map x command would work just as well.

Off topic: Amazing how many time in a row the same avartar can be put

On topic: point_clientcommand would work but it quits the map and then loads the new one and that looks ugly.

I think I'll join the fun

pestchamber wrote:
Off topic: Amazing how many time in a row the same avartar can be put

lol
I'll try out the point_clientcommand and look for the entity that you're not sure of it's name.

Note, the OP's question about importing sounds has been forked into its own thread because it's really its own topic.

Carry on.