Hi @Vilbert0 as they told you before you have to make separate listings for each bed, but in each listing you must choose the option "Aditional Option Prices" (I'm not sure how to name it because I have my app in spanish) and set 6 beds. Even you can also make a different price for the second and rest of the guests, just an idea to make it more interesting for those who are looking what you have... For example I have a room with a double bed and the second person pays less than the first one (it's for couples), it's different that your case, but maybe for you it's better to rent more than one bed or the hole room at once.
Oh! and I think you must set NO to immediate reservation, because if one person takes the hole room in one of your listings you need time to cancel the other listings, it's better to your profile than "canceling" a reservation.
Hope this helps you, and sorry my english.
Sofi