For instance, I have a WPMU blog network that is open to everybody to create their blog site.
How can a sub site/blog admin user point a sub domain to this sub blog site?
For example, this user's official website is http://www.users-domain.com, and he wants to point a sub domain: blog.users-domain.com to his blog site hosted on my WPMU network.
How to achieve this? I guess you may have some plugin to do that, too.
What needs to be set in Godaddy (domain register) and what needs in WPMU and Cpanel (hosting), respectively?