Domain aliases are domains that you own, but which do not contain any content. Instead, they point to the contents of another domain or subdomain on your account. This is useful, for example, to hold a domain that you will later sell, or to redirect traffic to another domain.
1) Login to cPanel with your user credentials
2) Under the Domain tab, click on the Aliases option
3) To add a domain alias, enter the domain name in the text box and click Add Domain.