Removing a subdomain
The Sub Domain Maintenance Menu allows you to remove subdomains from your account. This will not delete the file or directory that the subdomain displays.
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 Select the subdomain you wish to remove from the drop box next to Delete, and click on Delete.
NOTE: If the subdomain was removed successfully, the following will appear (except sub.domain.com will be your subdomain) :
The subdomain, sub.domain.com has been removed.
Removing a subdomain will not remove the file or directory that it displays.