How can I post to sell beds in one room (Hostal)?

I'm new with this platform and I found it so usefull, but I've an issue..

When I started I selected a number of beds to sell in one room, it's a Hostal, and if you look at the post you can select how many guests can get a bed in the same room, unfortunately I got few bookings when people can select e.g. 3 guest for 1 room and they only pay as 1 guest. Happend few times, so I decided to make a post of each bed. How can I solve this issue?