I was testing the ramps out in bisty and it's not that hard actually!! You have to use the exits and endings function, instead of teleporting the character to another room, you do it in the same one, just at a higher/lower part. You'll have to create at least two exits to ensure there's no bugs... (I think I did that, or else my character would just float above the world..). I guess you just have to try until you get it.
Dunno if this helps but yeah!