Help:Mapping elevators
From Killing Floor Wiki
Heres a sample map. [1]
In case ur unsure what properties are set on the actors, simply copy > paste the actor to WordPad/Notepad and you should see a list whats set (although some are set by engine and you can skip those, such as paths list). But basically what you need is (for a 3 floors elevator): 1 X KFElevator 6 X KFElevatorDoor (or 3 if its single mover doors) 4 X KFElevatorTrigger 3 X LiftExit 1 X LiftCenter
And a good way to check if ur elevator is working with the AI, simply go to top floor and type in console command "RMode 1" (wireframe mode) and look how they behave down there.