In vRealize Automation VMs can only be deployed on reservations. Now before business groups can provision VMs, fabric administrator has to create one or multiple reservations and assign to business group. There is also one more component called Reservations policies, you can compare them to vSphere tags, they allow you to categorize and group multiple reservations. For example if you have more than 1 gold tier reservation, you can created single Gold Tier reservation policy and assign it to all your Gold Tier reservations.
Everything virtual 