umm yea, very easily
1: open the map with terrain
2:File>Export Terrain Settings
3:Open Your Other Map
4:File>Import Terrain Settings (the one's u just made)
Get your selection tool, select all the terrain you want to move, click copy. Go to window > click on the other map [which you should have loaded before doing this], paste and place it.
Take the terrain brush and turn on selection, select all the map, go to edit/copy then in the map you want to put the terrain use paste, and what has this to do with triggers?