Hello [email protected],
You will need to basically create a folder under your primary site and then install wordpress to it. If you want to create an identical site, you will have migrate the files from other site into it and then manually adjust the configuration files. Here are the articles that will help you accomplish this:
Migrating Wordpress
I hope this helps to clarity the process!
If you have any further questions, please contact technical support or leave a comment at the bottom of the page.
Regards,
Arnel C.
You can set up a test site on a subdomain in your cpanel. We will update this shortly with a link on how.
Regards
James R