If you have multiple units that can also be booked altogether in a single reservation, you will need a parent-child listing setup where the parent listing is the combination of individual units and the child listings are the individual units.
When one child listing is booked, only the parent listing is blocked. If the parent listing is booked, all child listings are blocked.
Hospitable currently does not have a parent-child sync feature. If you merge the listings into the same property group, we will treat them as one calendar and therefore sync pricing and availabilities among all listings which is not the result you want.
In Hospitable, you should only merge the listings that share the same calendar (e.g. Airbnb and VRBO listings for the parent unit).
Airbnb has the Linked Airbnb calendars feature where you can assign a parent listing and the child listings. However, they only sync Airbnb reservations. A manual block will not be synced to a related listing. Hospitable sends manual bookings and Booking.com/VRBO bookings as manual blocks on Airbnb, so these cannot be blocked.
The import/export iCal feature in Airbnb and VRBO also only syncs reservations, not manual bookings.
It is not possible to import external calendars into a Booking.com listing that is connected to Hospitable.
A possible setup
It is still possible to have a parent-child setup when your property is listed on different platforms.
In Airbnb/VRBO, you would import all child listing iCals into the parent listing, and then import the parent listing iCal into each child listing.
If a child listing is booked in Airbnb, the parent listing is blocked in Airbnb. Hospitable then immediately blocks the child listing on VRBO/Booking.com. It will take up to 4.5 hours for us to detect the block from the parent listing in Airbnb, and (only if Availability Sync is enabled) we block the parent listing in VRBO/Booking.com.
If a child listing is booked in VRBO, the parent listing is blocked in VRBO. Hospitable then immediately blocks the child listing in Airbnb/Booking.com. We would not pick up the block from the parent listing in VRBO (since we never detect calendar changes from non-lead listings except for actual reservations) so you would need to manually block the parent listing in Airbnb/Booking.com.
If a child listing is booked in Booking.com, the parent listing does not get blocked anywhere. Hospitable immediately blocks only the child listing in Airbnb/VRBO. You would need to manually block the parent listing on all platforms.
If you manually create a booking for a child listing in Hospitable, we immediately block the child listing in Airbnb, VRBO and Booking.com. You would need to manually block the parent listing on all platforms.
If you need this feature, it will help to add your vote to this feature request on our public idea board.