You can permanently remove a subdomain from the database.
Open the Site Administrator Home
page.
In the IIS
Web Service area, click Manage
Subdomains.
On the Subdomains
page, select the subdomain to be removed.
Click the Remove
tab.
Click
OK. The subdomain is removed from the list.
Note:
Deleting a subdomain does not delete the corresponding physical directory
or files.