1. Upload the persistent disks to teh destination datastore

2. Open the destination View Administrator console -> Persistent Disks -> Detached

3. Click "Import from vCenter" and import all persistent disks

Now you can recreate VMs using this or can be attahced.

But the concern here would be how you will keep track of each persistent disk against user (This is going to be a very tough task)

If you make a media (datasore common to both then it is pretty simple, you can refer the blog post http://communities.vmware.com/people/skg/blog/2011/01/01/moving-svi-pool-across-vcenter-server-keepi...