Step 1: Login to your cPanel account and click on the 'Addon Domains' icon under the Domains tab.

Step 2: Locate your chosen Add-On domain, click the 'edit' icon at the end of the current document route. A customisable file path will appear.

Step 3: Edit the current file path to direct to where you wish the document root of the domain to be. For example /public_html/newfolder. To finalise click Select.