The Addon Domain Maintenance menu allows you to add addon domains to your account. An addon domain allows you to reach a subdomain when entering the name of the addon domain into a browser. This means that you can host additional domains from your account, if allowed by your hosting provider.
1. To access the Addon Domain Maintenance menu, click on the icon addon domains on the cPanel interface.
2 Enter the name of the addon domain in the blank field next to New Domain Name:
3 Enter the name of the directory which conatins the subdomain that the addon domain will point to in the blank field next to Username/directory/subdomain Name: (This directory will be the location for the addon domain's files, just as public_html is the location for your domain's files.)
4 Type in the password for the new addon domain, and click on Add Domain!
NOTE: You can upload files directly to this addon domain using the username and password for the addon domain to log in through ftp.
Addon domains will need to be registered with a valid domain name registrar before they can be added. Make sure that your account has the ability to use addon domains before attempting to add one.--