How to book multiple units with one reservation

Problem/Motivation

Scenario is a venue has huts (for mountaineers( with a number of beds (say 10). The goal is that a purchaser can book eg 5 beds in one hut.

I have followed the videos and seen possibly related Issues but not specifically requesting this approach. I suspect this has been asked/answered eleswhere but am not finding it.

My Content Type is set up with multiple Units. But seems each reservation is only taking one unit for each 'registration'.

Is there already a solution to let the person book up to the available number of units (eg if 7 of the beds are still available, then the person should be able to select up to 7, and register them in a single booking.

I will keep researching and hopefully can answer this myself shortly.