This is a special feature which can be added from the cPanel account itself. By using Addon feature you can add more than one domains to your existing cPanel account. Also you can define your own document root for the newly creating Addon domains.
If you do not have an Addon Domain icon in your cPanel, then your hosting plan does not currently have any Addon Domain allowances. To purchase additional Addon Domain allowances, please submit a ticket at our Help Desk.
Steps to add new domain as Addon
1) Log into cPanel.
2) Move to “Addon Domains under Domains Tab”
3) Fill the following fields.
Please create a support ticket if you’ve any questions.