From the left side Menu, select 'Management' option and then select 'Zones & Rates'.
From the main rate index page, locate the zone desired and then chose the 'Actions' menu on the right side, and choose 'Manage Reservations'.
Land on the Reservations Management Page and choose the Inventory tab and a date range desired.
Choose a month and year from the drop down so you can drill in and view the inventory for a specific date.
Scroll down to view the inventory breakdown that can be adjusted as needed.
The capacity (inventory) can be adjusted by rate by adjusting the number in the field associated, to allow for specified inventory for your operation.
Any field left blank becomes available until all of the reservations have been filled based on the total capacity.