Import the virtual machine directly into vCloud Director to configure warm migration with a preloaded seed.
Verify that you have a removable media containing exported virtual machine files.
ovftool PATH_TO_DISK/VM_FQDN/VM_FQDN.ovf 'vcloud://VCD_USER@VCD_IP:443?org=org1&vapp=VM_FQDNvApp&vdc=vdc_org_name'
Do not power on the imported virtual machine.
What to do next
You can now initiate a migration by using the created seed vApp in vCloud Director.