Step 1: To access the Addon Domains tool, click on the corresponding icon located on the main screen of your cPanel interface.
Step 2: Enter the name of the addon domain in the blank field next to New Domain Name.
Step 3: Enter the name of the directory which contains the subdomain that the addon domain will point to in the blank field next to Subdomain/FTP Username: (This directory will be the location for the addon domain's files, just as public_html is the location for your primary domain's files.)
Step 4: Type in the password for the new addon domain, and click on Add Domain!
Remove an Addon Domain Detailed Tutorial
The Addon Domains allows you to remove addon domains from your account.
Step 1: To access the Addon Domains tool, click on the corresponding icon located on the main screen of your cPanel interface.
Step 2: To remove an addon domain, click on the Remove link next to it.
You can also redirect the addon domain to another URL using the Manage Redirection link.