I figured out how to do this. For those who might be interested, you need to go to edit then click on map. Keep a record of the width and height. Go back to edit and click on copy whole map. Now make a new map and set the width and height the same and set theater to whatever you please. Once map is generated go to edit and click paste centered. Ore posts, trees, or any buildings will not transfer over.
I'll probably make a desert version of heck freezes over sometime this week.