Source: vApp with 3 VMs.
Destination: clean vDC
I need move vApp to other organization vDC. How to do it?
You can add it to catalog and share the catalog and deploy the vapps.
If the second org VDC is under the same organization, you can just shut it off and use the 'Move To' action. This won't work between different organizations though.
Also if the 2 Orgs are in different geographical location, and the vApps are very big in size, sometimes i have seen sync from source catalog to destination catalog timing out and sync never getting complete