You can create an alias for a cmdlet, but not for a cmdlet with parameters.
Why don't you define a function in your profile instead?
$credential = import-clixml -path 'C:\documents\PowerCLI\My-credfile.xml'
$vCenterServers = @("vcsa1","vcsa2","vcsa3","vcsa4","vcsa5")
connect-viserver $vCenterServers -Credential $credential
}
Blog: lucd.info Twitter: @LucD22 Co-author PowerCLI Reference