I have a domain .net I want to use subdomain.
Can you help me?
I don't mean to be rude, but it looks like you got in the wrong apartment.
Ring at your Web host's door, they're likely to have just the answers you're looking for.
Luciano ES Santos, SP - Brasil
Although, it might be of note, that on the site http://www.hotscripts.com/PHP
there are some scripts that will automate the process of adding subdomains, especially if you plan on having many users or mass subdomain addition.
i agree with the previous poster though, this is more the department of your hosting provider.