12 pitches require 12 separate listings @Lisa5494 .
Once someone has booked a pitch, the listing is blocked so that no one else can block exactly the same space. - Think about it, if you were letting rooms in a house/hostel/hotel, you obviously don't want that exact room let to more than one party at once! So someone books = listing no longer available!
I checked your listing. As it stands, ONE person can book for any number of guests between 1 & 16. But it's not set up for unrelated individuals to book their own pitch simultaneously. 1 pitch = 1 listing on Airbnb. (Check out my profile page where I list 3 rooms within my house - or did pre-Covid legislation!)