Hello.
If you need to make the specific number of bookings per days, then you need to check the Booking Calendar Business Large version, where is possible to make several reservations per specific FULL date(s) by visitors (not time slots). Please read more about it here https://wpbookingcalendar.com/overview/#capacity
At this version is possible to set capacity of the booking resource, so date(s) in calendar will be available until number of reservations is less then capacity of the booking resource.But in this version is possible to make reservation only for FULL date, not a time slots (time slots in this version only record data in the DB, but do not play any logic in reservation).
Please read more info about the booking resources and how to configure them here https://wpbookingcalendar.com/help/booking-resource/
Also we highly recommend to check this article about different configuration of capacity and availability https://wpbookingcalendar.com/faq/capacity-concept/
You can test Booking Calendar live demo at this page https://wpbookingcalendar.com/demo/ to be sure in functionality and do not have misunderstanding.
Kind Regards.
