There is really no direct link as such.
What you could do is create some admin accounts that are limited
to change some things on a particular group, and give this
admin account to the users. Unfortunately this is only done at the group
level. If you want users to be able to change their passwords
though you might need to consider installing user changeable passwords as outlined on:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_soft/csacs4nt/csnt26/jacsntuc.htm
