Firat you need to Download the content of your addon domain to your local PC.
Try to Backup any associated database(s).
Then Create a subfolder inside the new cPanel’s public_html folder.
Now Upload the content of your addon domain to this new folder.
Restore the database backup(s) into the new cPanel.
go back to the old cPanel and remove the addon domain from under the Addon Domains icon. (You do not need to delete the original content or original databases.)
Only If old cPanel and new cPanel are on the same server,
Go to the new cPanel and click the Addon Domains icon. Enter the addon domain name where it says “New Domain Name”.
Through the “Document Root” you must enter /public_html/subfolder/ (replace ‘subfolder’ with the name you chose in step 3). Fill out the remainder of the form and click the Add Domain button.
If the old cPanel and new cPanel are on different servers, then you will need to update your addon domain name’s nameservers (or other DNS records).
This is not a transfer type supported by WhoGoHost.