So got around a computer that can actually run WED and GED and started to ccreate a terrain. But when I tried to place the terrain next to other I encountered a thing that ruined, I couldn't get terrains' edge vertices to the same height. I couldn't smooth terrains at once so it didn't help and when I tried to smooth vertices individually... well quess you can figure how pain it was. When I placed the terrain "inside" one another the result looked too artifical.

So have I not seen something in GED that would allow me to smooth / place the vertices on the edge of two terrains, placed side by side, to the same height? Or is there a way to code this? Or any other helpful tips when designing outdoor levels?