Aggregate availability across multiple calendars (single booking calendar)

I’d like the ability to select one primary calendar where all new bookings are created, while simultaneously syncing availability from multiple other connected calendars. Any event marked as busy on any connected calendar should automatically make that time unavailable for booking. This prevents double-bookings and allows a single booking calendar to stay organized while still respecting conflicts from other calendars. Optional add-ons you can include if you want: Choose which calendars are “booking” vs “blocking” Choose which event statuses block time (Busy vs Free) Option to include/exclude all-day events and tentative events Support for multiple calendars within the same Google account and across accounts photo attached for reference...