In cPanel -> Domains -> Create a New Domain -> Domain

Untick Share document root.

This will still attempt to create a new domain under public_html. Allow this.

Click Submit.

You now have an active directory for this account under public_html for this new Domain Name (or Sub Domain Name)

The example in this is for a user called midpacific.

And a new subdomain academy.midpacificfutures.com

1. Locate Subdomain Config

   cd /var/cpanel/userdata/midpacific

2. Does the domain exist?

   ll academy.midpacificfutures.com

   Yes

3. Edit academy.midpacificfutures.com

   emacs academy.midpacificfutures.com

4. File contents, change

   documentroot: /home/midpacific/public_html/academy.midpacificfutures.com

   to

   documentroot: /home/midpacific/academy.midpacificfutures.com

5. Edit academy.midpacificfutures.com_SSL

   emacs academy.midpacificfutures.com_SSL

6. File contents, change

   documentroot: /home/midpacific/public_html/academy.midpacificfutures.com

   to

   documentroot: /home/midpacific/academy.midpacificfutures.com

7. Edit the Main Domain YAML:

   emacs /var/cpanel/userdata/midpacific/midpacificfutures.com

   1. But there may not be anything to do here.
8. Create the New Directory

   cd /home/midpacific/

9. Move public_html/academy.midpacificfutures.com here

   mkdir academy.midpacificfutures.com
   mv /home/midpacific/public_html/academy.midpacificfutures.com/* /home/midpacific/academy.midpacificfutures.com/

10. chown -R midpacific.midpacific academy.midpacificfutures.com

11. Rebuild Apache Config

    /scripts/updateuserdatacache
    /scripts/rebuildhttpdconf
    Built /etc/apache2/conf/httpd.conf OK

12. Restart Apache

    /scripts/restartsrv_httpd
    httpd restarted successfully.

The website is being downloaded instead of displayed

Go to the user and scan for WordPress websites.

Set the upsite up in WHM MultiPHP Manager with 8.4. 
PHP-FPM does not appear to have to be turned on.