Terrain Editing issue

I have a map with 45 variables but I need to start over with the terrain layout.

Since I can't copy the variables to a new clean map, I can only make a copy of my old map, but, of course, I'm still stuck with the old terrain.

How can I delete ALL TERRAIN at once?

I'm able to select it all, but Delete and Cut aren't available options at that point.

Create a new map, use ctrl-a to select all of the terrain, and copy it. Then go back into your map, and paste over your old terrain.

Now why didn't I think of that!? (No brain, no pain!)

An excellent and simple solution. It took about 90 seconds on my 192x192 map for the paste to finish, but it worked like a charm!

Thanks again!!

Uhh...did anybody think of this?

Tools->Advanced->Reset Height Field

Care.