Before adding an Addon Domain name, you need to point your Addon Domain name server to your main domain name server, and you will need to wait for domain propagation. It usually takes between 12 and 24 hours.
1. Log in to your cPanel account.
2. In the Domains section, click on the Domains Icon.
3. On the Domains page, click on Create A New Domain.
4. On the Create A New Domain page, enter the fully qualified domain name in the Domain text box.
5. Leave the Share document root with “example.com” checkbox unselected.
6. Enter a subdomain for your addon domain in the Subdomain text box.
7. Click on the Submit button.
If the domain is successfully added, you will receive a message like this.
