Please follow the steps:
1. Login to the cPanel
2. Go to the "Domains" link.
3. Click on "Create a new domain"
4. Type in the domain name in the box
5. Uncheck the option "Share document root"
6. Type in the directory name where you want to store your new domain's files
7. Finally press submit
This will create the domain under your professional account as an addon domain. Now you need to upload your website contents in the folder you specified in option 6.
