I've got an overlay done only 14 parking spots, and I'd like to use it over the MKE layout that I have. I labled the .txt file, KMke2, but when I go to save it asks if I'd like to save over the current layout and not create a new airport. Is there a manual for AFCAD or can someone help me? There are airports with up to 4 overlays, how do they do it?

The end of the AFCAD manual covers overlays in detail. I recommend you start there (or at the beginning if you haven't read it). There is a wealth of information in the AFCAD and TrafficTools manuals that are a "must know" for any AFCAD designer. It will make your life much simpler.J

Also you will get better AFCAD responses in the TTools forum, just down the main menu list.