You can use the fcp wwpn-alias set command to create a new WWPN alias.
You can create multiple aliases for a WWPN, but you cannot use the same alias for multiple WWPNs. The alias can consist of up to 32 characters and can contain only the letters A through Z, a through z, numbers 0 through 9, hyphen ("-"), underscore ("_"), left brace ("{"), right brace ("}"), and period (".").