Terry,
You can do this but the server needs to be in standalone mode first, then during post you can access WebBIOS (Ctrl+H depending on which controller you have) or if your server is running 1.5 CIMC firmware, then you can do that from CIMC without having to reboot to enter anywhere else.
Bottom line, that can be done but not through UCSM.
Rate ALL helpful answers.
-Kenny