1 To access the Sub Domain Maintenance menu, click on the icon above the word Subdomains on the main screen of your cPanel interface.
2 Enter the prefix for the subdomain in the first blank field, and click Add.
NOTE: If the subdomain was added successfully, the following will appear (except sub.domain.com will be the prefix you are using, and your domain):
SubDomain Added
The subdomain, sub.domain.com has been added.
3 Click on Go Back.
4 To make the subdomain work, select it from the drop box next to Setup Redirection and click on Setup Redirection.
5 Enter the URL which you wish the subdomain to display in the blank field, and click on Save.
NOTE: If the subdomain was redirected properly, the following will appear (except sub.domain.com will be your subdomain, and http://www.domain.com/test.html will be the URL you have selected your subdomain to display) :
SubDomain Redirection
sub.domain.com is currently being redirected to http://www.domain.com/test.html