Hello I Wanted to know if is possible to create an elevator slide that shifts in diagonal direction bringing on character and or npcs ...

like a kind of elevator , is it possible ? If so does anyoe knows of a script ?

It depends entirely on what kind of elevator you want, but, I would think the safest thing to do would be to classify the whole thing as a vehicle / furniture, and possibly use SplineTranslateTo to move it around while actors are attached to it. But I could be way off base.

Kind of a platform cableway , that can allow moving from a higher point to more down in a valley and back ....

Yeah, use one of the translateto functions, but there's something you need to be aware of... you have to either set it as the vehicle for the actors, or translate them with it. Here's what I learned: you CAN translate objects and their collision meshes, by editing the NIF:

But this does not work very well with anyone riding on it. I made a video in which you can see why (skip to about 1:50):
http://www.youtube.com/watch?v=gsmAN_OzVRg&feature=plcp
Maybe it doesn't demonstrate very well, but if it's faster than the speed of a snail, the collision update will be bugged and you'll easily fall off even if you don't move.

So you can translate the vehicle and the actors at once, and it works fine, but you can't move while that's happening. Same would be true with setvehicle. See example here:
http://www.youtube.com/watch?v=hRyTC_BvZS8&feature=plcp

You will also have to move the NPC actors in and out with a script, because there shouldn't be a navmesh going over the object, or else when it's not there, NPCs might walk over and fall below it, I think.

The difficult part of the script would be referencing all the actors who are going to be on the moving object if you don't know exactly who is going to be on it. This is where SetVehicle would help... perhaps if they walk into a trigger as they get too close, or something.

So, you said you are looking for a script or something... well, what the script looks like will depend on when/how/by whom the elevator needs to be used.

Lastly, I don't really know the difference between TranslateTo and SplineTranslateTo. I've tried them both with various parameters and they seem to result in the same behaviour.

I can't say I understood what I shoudl to tough :/ ...

Well, to just move the player and the elevator it is easy. I'll give you an example script, which could be attached to an activator (like an elevator button).

Actor property PlayerRef autoObjectReference property Elevator autoObjectReference property Target1 autoEvent OnActivate(ObjectReference akActionRef)  if ( akActionRef as Actor == PlayerRef )    ;//Player activated the elevator, put the player in the elevator car    PlayerRef.MoveTo(Elevator, 0, 0, 0, false)    ;//Now translate them both to the target ref    Elevator.TranslateToRef(Target1, 300, 0)    PlayerRef.TranslateToRef(Target1, 300, 0)  endifEndEvent

Target1 should be a marker or something that the elevator can move to... this is the easiest way to do it.
The player is moved to the elevator's position first because if they activate it from outside, they would still translate and would go through other objects to get there, or might be floating, or something else.

Also you have to copy a mesh and do the nifskope stuff that I posted before still... if you don't change those, the translation will still work but the collision model will be left in the original location.

Hopefully this helps you understand what to do...

Like I said, the difficulty is in either allowing the player to walk around while it's moving, or every actor/object in the elevator to move with it while not knowing what they're going to be.