You must allocate resources to machines by creating a reservation before members of a business group can request machine provisioning.
You can work with Amazon reservations for Amazon Virtual Private Cloud or Amazon non-VPC. Amazon Web Services users can create a Amazon Virtual Private Cloud to design a virtual network topology according to your specifications. If you plan to use Amazon VPC, you must assign an Amazon VPC to a vRealize Automation reservation. See Using Amazon Virtual Private Cloud.
After you create a reservation, you cannot change the business group or compute resource associations.
For information about creating an Amazon VPC by using the AWS Management Console, see Amazon Web Services documentation.