How to configure subdomains in cPanel
A subdomain is a domain that is part of a larger domain, based upon a prefix name that you choose. For example, the example.com domain might have a subdomain for the support department that directs visitors to a separate area of the web site. If the subdomain prefix is support, then the fully qualified domain name (FQDN) is support.example.com.
You can use subdomains whenever you want to create separate areas on your web site that are accessible using different FQDNs.
ADDING A SUBDOMAIN
To add a subdomain, follow these steps:
Login to your Client Area
Click on Services
Click the Green Active button you wish to add the Sub Domain to
Click on cPanel in the upper left Menu
In the Domains section of the cPanel Click on Sub Domains NOT Addon Domains
Under Create a Subdomain, type the name of the subdomain that you want to add in the Subdomain text box.
cPanel automatically fills in the document root path by using the subdomain name that you provide. This path is where the subdomain's files are stored. If you want to store the subdomain's files in another directory, type the full path in the Document Root text box.
The following names are reserved on managed accounts, so you should not use them for new subdomains:
cpanel
ftp
mail
webdisk
webmail
secure
www
whm
Click Create. You can now add content to the subdomain by placing files in the subdomain's document root.