Howdy, I use a program (freebie) called flattex. Goggle it. It gives easy to understand instructions and prints the exclude and flatten switches for you. You just copy and paste them into FS9 scenery.cfg. If you flatten and/or exclude more than one location in the same area be sure to number them; i.e. .0, .1, .2, etc. Have fun with it, I do.