WordPress MU

I need to install wpmu 2.7.1 in linux server. this server is managed by plesk control panel 9.0. i have created a domain and uploaded the wpmu source. now how to setup the .conf file to have the sub domain like urls?

http://user1.blocial.com/
http://user2.blocial.com/ .....

how to make/what are the changes in .conf file to get this done.

thanks in advance. :)

Can you use wildcard subdomains in Plesk. If so, then you can create a new A record like so if it does not already exist:

Host: *
IP-Address: your ip address
TTL: 3600 (or whatever it should be)