Shared availability between products within the same category

[Valentina R]

Example of how it would be used:

Category 1 :
Product A, Product B, Product C
for each product I have : staffMember1, staffMember2, staffMember3

Category 2 :
Product C, Product D, Product E
for each product I have : staffMember1, staffMember2, staffMember3

the 17/11/2021 at 12:00, a client schedules Product A. It’s OK. Automatically with staffMember1.
the 17/11/2021 at 12:00, the slot for Product A, Product B, Product C is no more possible. Because there are in the same category.
the 17/11/2021 at 12:00, a client can schedules Product C. It’s Ok because product C is in another category and no product of it has been already scheduled. Automatically with staffMember2 (staffMember1 has been scheduled with product A).

Requested here.