A step-by-step guide to help you redirect a subdomain to an external URL in cPanel.
Step 1: Log into your cPanel account.
Step 2: In the Domains section, click on the Subdomains Icon.
Step 3: Under the Modify a Subdomain list you can see a list of subdomains.
Step 4: Click the Manage Redirection link that corresponds to the subdomain that you wish to manage.
Step 5: Under the Subdomain Redirection option, you should enter the link to which you want to redirect the subdomain in the available text box.