Best way to index a sub domain?

Exactly! Treat them as Google does: subdomains are completely separate sites in the eyes of big G.

With iRedirector you can run your own CJB.net style subdomain forwarding service! Adding such a web service can easily generate traffic for your website and can become a real good and easy income! Your members just signup and can instantly use your short forwarding URL to hide behind iRedirector is totally PHP and MySQL based. This means superfast retrieval times and makes the script much faster than those other scripts using text files to store the data. Another advantage of PHP compared to CGI is that it's a lot easier to install and it minimizes the server load dramatically!
The script can be installed in a minute even if you have never used any script before!
And if you really cannot install the script yourself we can do it for you at the rate of $ 25.00 per installation.
After you installed the script you have total control over it through the user friendly administrative interface.

Thank you !