Such functionality available in all paid versions of Booking Calendar. In the Booking Calendar Free version supported only one default booking resource (calendar).

1) After installation paid version of Booking Calendar, you will see the new menu WP Booking Calendar > Resources page.

Booking resources - it's your objects (like rooms, cars, tables...) or services, that can be booked. Each booking resource is the unique calendar with own availability and own bookings.

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2) To create a new booking resource, please enter the name of the booking resource (calendar) at the text field in top toolbar and click on "Add New" button.

3) Now you can publish the booking form for this new booking resource (calendar). There are several ways, how to do this.

You can make automatic publishing of the booking form for this booking resource into exist or new page, by clicking on "Publish" button near this booking resource:

Or you can create a new page or open the page for editing, and insert the Booking Calendar shortcode for this new booking resource manualy. the detailed description about how to insert / publish booking forms you can find in this FAQ guide.