Any specific features that you are referring to?
If you have a vCenter managed by a vCloud Director, you can import a VM - can be online in new vCD 8.10 but must be powered off in previous version
Import Running VM to vCloud Director – Tom Fojta's Blog
VMware vCloud Director 8.10 Documentation-Import a Virtual Machine as a vApp
If you are referring to vCloud Connector, the VM needs to be powered off
