If you wish to Add Another Seperate domain into cPanel, there is an option called Addon Domains. Login to your cPanel > “Addon Domains”.
After that Fill your domain name in domain name section without www.
Don’t fill subdomain and Document Root. Because it will be auto filled it self when click on somewhere else.
After that press Add Domain button.
Document Root is the Folder of you must upload your website. It should be in cPanel > File manager > “example.com”. Upload your all website files to the inside of example.com folder.
After that, Update your Nameservers on Domain Name.
Enjoy.