If you mean copy terrain from one map to another...
Source map - drag a terrain selection box over the area you want to copy.
Send a copy command (Ctrl + C or in menu).
Desternation map - drag a similar sized terrain selection box over the target area you want the terrain to be.
Send a paste command (Ctrl + V or in menu).
You may need to keep both maps open and toggole between them for this to work
If you mean copy terrain from one map to another...
Source map - drag a terrain selection box over the area you want to copy.
Send a copy command (Ctrl + C or in menu).
Desternation map - drag a similar sized terrain selection box over the target area you want the terrain to be.
Send a paste command (Ctrl + V or in menu).
You may need to keep both maps open and toggole between them for this to work
You can move the terrain 100% to the letter via mpq manipulation but unless you know what that is/means I'd suggest doing it the above way.
Btw Arth sorry about the terrain you requested, the computer I made the terrain on got messed up. After not working on it for so long, I don't feel like continuing the terrain. When I go home tomorrow, do you want me to give you the terrain to finish? It doesn't look as good as it would have if I finished it, but it's still usable.