how to create a cave?

i am starting a rpg map which would include a cave, but because the last time i used the WE is in the beta period, so i get no idea how to make.
the rpg is going to be in the Cityscape tileset, so can anyone tell me is it possible to make a cave in the Cityscape tileset. if no, just tell me how to make a tileset. thankyou
also here is another related problem with the tileset. i been using the zepir's editor to try to bring in more cliff types in my map, but i failed everytime i tried to bring in cliff type from different tileset. the top part is alway different than the lower part of the cliff. i know this have been asked many time with no answer, but plz update me with the new discoveries.
thankyou. :bgrun: :gsmile: :gsmile:

to make caves with a cityscape tileset you could just modify your cityscape tileset, kick out 2 or 3 types of tile you know you won't be using and replace them by 2-3 tile types from the dungeon tileset. in tools > advanced > modify tileset

I think he means when you get close to a cliff cave,a doodad, i go inside, another part of the map,.

no what Axim is a assuming is right.. the one you suggested is just triggers the problem with using cityscape as the initial tileset is elevation will take that tileset.. so when you try to create a cliffhead it would look like a giant hole in a building(i tihnk thats cityscape or is it Dalaren?) theres no real way to avoid this.. maybe strt on another terrain and copy and paste what you've done already