cPanel has yet to offer this option although it can be done.
In order to park a domain on top of an addon domain, please do the following:
1. Login to cPanel and click Addon Domains
2. In the field to the right of “New Domain Name”, type the domain name you wish to park on top of your addon domain
3. Click outside the text box and your other settings will populate.
4. Under “Document Root:”, erase everything except “public_html”
5. Look down to your current addon domain and its “Document Root”
6. Take the “Document Root” and insert it in the field to the right of “Document Root:” at the top.
7. Insert any password in the password field. (You won’t need to remember this password, so just use the Generate Password button.)
8. Click Add Domain!
You have now just parked a domain onto of an addon domain.
Note: If you receive an error similar to this:
Error from domain wrapper: Domain already exists, it was not added.: example.domain.com
This could be due to one of two reasons:
1. The domain you are adding has already been added and therefore already exists. So, you will need to delete the domain from Addons, Parked or Subdomains before proceeding.
2. The subdomain which cPanel automatically generates already exists. When this happens, you can manually change the subdomain which cPanel generates for your addon domain.
* EXAMPLE: If you are trying to park example.com on example.com.au, cPanel will fill in the “subdomain/ftp username” field with “example” (which may already exist). Just change the “subdomain/ftp username” to a new variation, like “exampleau”.
* Park Wrapper Error