Location: Settings > General > Advanced > Booking types
You can use Booking types if you are running a special offer (campaign) or if you want the guest to choose a specific location/room (i.e. eat outside in the garden).
If you have one or more “online” booking types the guest must select one of them. So if the guest should be able to choose between inside or outside you’ll need a booking type for each.
See also: Creating booking types