When I change the rent manually on Pipeline, I want the rent I input manually to remain the same when I change the number of guest, as long as it's not exceeding the base guest.

For example. my base guest is 10, I changed the rent to $100 manually on Pipeline. When I edit the lead once more with number of guests = 2 (which is <10), I expect the rate $100 to be kept, instead of the (dynamic) rate on pricing tab.