Welcome to the Community,
Some options are:
- use VMware Converter to do a V2V migration
- export/import the VMs as OFV/OVA from the File menu
- backup and restore the VMs
- manually migrate the VM using ovftool (see http://www.virtuallyghetto.com/2012/06/how-to-copy-vms-directly-between-esxi.html)
André