Domain mapping provides a simple way to point multiple domains to your primary hosting account.
For Multisite admins, it’s also useful in that it allows you to map any domain to your network, giving you the option to offer domains to your users.
Mapping domains can seem complex and fiddly if you’re unfamiliar with cPanel and messing around with IP addesses, but it’s actually a straightforward process and doesn’t take long at all.
In this tutorial, I’ll show you how to use the Domain Mapping plugin to map a domain to your Multisite network, so http://network.com/awesome becomes http://www.awesome.com
Getting Starting With Domain Mapping