Is there a quick way to flatten ALL the terrain?

Hey,
Just got torque and was learning how to make missions and things.

When I went to make a new mission, it loaded some default terrain that was full of hills and stuff(this is in the example fps game). Is there any way to flatten out the terrain all at once? I just think it would be easier for me to make the terrain how I want it if it started out flat, and not loaded with hills and such.

Thanks!