There are a couple of diffrent ways to make elevators, the two main ones are the velocity and the setplayertransform.
Setplayertransform elevatorFirst you need to name each floor ie Floor1, Floor2
To go from floor one to floor two use
Onactivate-Floor2-SetplayerTransform-player-[]
And to go down you would just need to switch the floor2 to floor 1
Onactivate-Floor1-SetplayerTransform-player-[]
Velocity elevatorsThe events for this will vary depending on how far apart the floors are, you also will need to name the floors and this one is more complicated.
To go from floor1 to floor2
Onactivate-floor2-Disappear-2
Onactivate-player-addvelocity-10
To go down from floor2 to floor1
Onactivate-0floor2-disappear-2
Overall the setplayer transform is usually easier however if i'm right you need to download the events for it so check in addons if you don't have it by default.
*For the addvelocity 10 I'm just guessing, its been a while since i've used velocity elevators so it might be a little off.