Create virtual Subdomain with .htaccess

[vntux]

I want to create virtual subdomain like:
[cat_name.domain.com...]
It returned from: [domain...]

How to do that ?

Thanks

Here is my site:

<snip>

[edited by: jdMorgan at 4:20 pm (utc) on July 23, 2009]
[edit reason] No URLs, please. See Terms of Service and Charter. [/edit]

[jdMorgan]

Try a search [google.com] on WebmasterWorld for "rewrite subdomain to subdirectory" to get started.

Jim