To delete subdomains, do the following steps:
Log on to SiteManager if you haven't already logged in.
Go to .
There should be an action columns with several options depending on the type of subdomain. Click link on the corresponding subdomain name you want to delete.
On the next screen, you need to confirm that you want to really delete the subdomain.
Warning
Deleting a subdomain will also delete all its web contents and email mailboxes. Please make sure you are absolutely sure that don't have anything important inside the subdomain you want to delete.