Forming terrain

This probably sounds really noob but how do u make a one level of terrain form into a high or lower one?

Yes it does sound very noobish, try using the terrain palete, there is a icon with a red dart going up, and a red dart going down (I used WE long time ago so i can't remember very well) also below are icons for noise, lower, higher terrain...
So did you ever used a WE before? (just asking)