@Susan5933
You don't need someone else's help to do this, you can do this yourself You can simply set up multiple listings and link the calendars. You would have to decide which 2 out of 3 rooms you want to offer in the Parent listing:
Parent Listing (2 rooms - decide which 2)
Child listing 1 (double)
Child listing 2 (single)
Child listing 3 (twin)
Use caution to sync the calendars correctly in order not to have a double booking. Also, reservations will properly block the calendars, but if you want to block dates for personal use, you have to manually block all the calendars.
Be sure to make it clear on the smaller listings what bedrooms, bathrooms (and any other room) that will not be available when booking the smaller listing. Ensure your smaller listings only show photos of the bedrooms/bathrooms they will have access to. I usually suggest it also be mentioned in your message to guests after booking (many guests don't read the listing properly).
Multiple Listings Same Property
https://www.airbnb.com/help/article/289