<VirtualHost 10.0.0.1>
ServerName www.abc.dom
ServerAdmin webgirl@abc.dom
DocumentRoot /www/abc
</VirtualHost>

When you define the Virtual Host replace 10.0.0.1 with the ip you want the server to listen to for the virtual host. You will also want to make sure you define it with the Listen Directive pointing it to the ip as well as any others needed.

ServerName you define with the address of the virutal host..you can also use *.abc.com to catch all sub-domains of the domain.

DocumentRoot is where the virtual host is located on the server..the files to be hosted.

Hope that proves helpfull.

Use this and you can forget about all the other virtual hosting directives.

VirtualDocumentRoot "/www/data/%0"
VirtualScriptAlias "/www/cgi-bin/%0/"
UseCanonicalName Off

The %0 is a placeholder for the server name given in the incoming HTTP request. Adding a new host is as simple as adding a new directory, no further httpd.conf changes required.