It's me again! Are you looking for the equivalent of a "wcc -s" command? Or are you looking for an output of all the groups local to the filer?
I don't think there is any built in command with the wcc functions, but I also have not installed the 2.3 toolkit yet. I do know that using the 2.3 toolkit you can use invoke-nassh -command COMMAND to run any particular command that there is no cmdlet for.