Choose the parent domain and decide whether the new site should have separate files. For a staging site, prepare authentication or another access restriction before publishing copied content. A subdomain is not automatically private just because it is called staging.

1. Open Domains > Create a New Domain and enter the complete subdomain name, for example blog.example.com.
2. Clear the shared document-root option for an independent site and choose a distinct folder. Review the generated path before submitting.
3. Create the domain and upload or install the application into its displayed document root. Keep its database separate from production if it is a test copy.
4. Create the subdomain’s DNS record wherever the parent zone is authoritative. If DNS is external, a record in cPanel alone will not make it public.
5. Issue or include the hostname in SSL and set the application’s URL to the new HTTPS address.

Check the hostname from a browser and verify that it serves the intended content rather than the parent site. Test links, assets and any login or form.

If the subdomain does not resolve, inspect authoritative DNS and any conflicting A, AAAA or CNAME record. If it shows the parent website, compare document roots and application settings. Remove temporary test files after the site is working.

• Understanding domains, aliases and subdomains in current cPanel
• Retiring a subdomain from cPanel
• Redirecting a cPanel subdomain to an external URL
• Adding a domain alias that shares an existing cPanel website

• cPanel documentation