Hi Kelly,
It sounds to me like you want to have 2 listings. 1 for a single room and 1 for the entire place. This is pretty easy, contact Airbnb and ask them to duplicate your existing listing and then you can update it with some photos and suitable info to suit.
Then it's just a case of handling the calendar juggling so you don't get bookings crossing over.
Just be wary that there is a considerable different to airbnbing a spare room to your whole home and how people treat it. Do your homework and over communicate are my two big recommendations.
Cheers,
Paul
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