You can create a custom datacenter from the Custom Datacenter tab of the Environment page.
A list of the objects in your environment appears in the CDC wizard. You can select objects to add to your custom data center:
When you add an object, its children become part of the custom data center. An object can belong to multiple custom data centers. The objects that you can add are vCenter Server, vSphere data center, vSphere cluster, and VMware ESXi™ host.
You can clone a custom datacenter and use it as a template.
