Use the Decommission Hosts study type.
1. Select the hosts from that cluster under Target Virtual Hosts. You can also specify the respective cluster in the Target Filter.
Assignment Action for Existing Guests should be "Move all for this study".
2. Next step is to only Create New Virtual Hosts. Change the CPU Model to fit to your purpose.
"Use Existing Virtual Targets" option should not be checked.
Under Advanced options, set "Host CPU Utilization Threshold" and "Host Memory Utilization Threshold".
3. Next page shows you a summary report. Look for the number of Physical hosts.
Hope this helps,