I don't know, offhand, but if you haven't got an auth server then presumably you don't have an existing /adm/users, so you could modify my instructions to
cfs main # or whatever you called yours
allow
create /adm adm sys 775 d
create /adm/users adm sys 664
users default
then connect as anybody (9fs <newfs>), make any other desirable
adjustments (cd /n/<newfs>; chmod 775 .; chgrp sys .) and then back on
the file server console, do
disallow
# create accounts as necessary with newuser
dump
