Ah, I see. I don't see a feature like that in the toolset. If you have a large area that you want to re-create in the editor, and you have a picture of it, the most efficient thing to do may be to import a height map. Chriskang was kind enough to provide a
height map importer, so if you can create a gray scale image of your true territory, you could generate the area pretty quickly with all the proportions you wanted.