In 1 AFCAD, you can build 2 seperate airports.
Give each airport its own tower (with frequenices), their own runways / taxiways .... that is totally seperate from each other.
or what I have done is make the airline runway 9000 feet long, and the Heli runway MAYBE 200 feet long. I seriously doubt that even a C172 can land and stop in 200 feet unless you are doing 30KIAS at touchdown. The only downfall, is that ATC may tell your Bell 206 to use the Liner runway periodically depending on weather.
You can connect the heli-port to the Liner-port with Taxiways, but mark them as CLOSED and assign them accordingly. (single left click on the Taxiway in question to highlight it > Right click > Properties > LINK TYPE > CLOSED) NO AIRPLANES / HELO'S / AIRCRAFT can use that taxiway as ATC will no longer recognize it being open/useable. [you can still travel on it, but as far as ATC is concerned, its CLOSED!]
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