You can work with the REST API reservation service to perform a variety of functions, such as creating and updating reservations.
The vRealize Automation REST API reservation service supports the following reservation types:
vSphere (except for FlexClone in vSphere)
The reservation service is extensible, which allows you to add new reservation types.
A reservation must belong to a business group, also referred to as a subtenant. A business group can have multiple reservations on the same resources or on different resources.