To delete room types in AbodeBooking navigate to Settings > Accommodation > Accommodation Options.
You can only delete a room type if it does not have any rooms assigned to it. If it does have rooms assigned to it, you see the "room" icon in the corresponding room type row: 
To make the option of deleting a room type available, either
- delete the rooms with the corresponding type you would like to delete
- OR assign another room type to the rooms with the corresponding type you would like to delete
As soon as you don't have any rooms assigned to the corresponding type you would like to delete, the option of deleting the room type will be available with showing the delete icon in the corresponding room type row:
