Changing subdomain information
You can change the subdomain information any time after you add it.
To change a subdomain:
Open the Site Administrator Home page.
In the IIS Web Service area, click Manage Subdomains.
On the Subdomains page, select the subdomain to be changed.
Click the Edit tab.
Change the path for the home directory in the Home Directory text box. This path should be in the domain file system.
Note: If the home directory specified is outside inetpub\wwwroot, then server will prompt the client for authentication.
Click Save to commit the changes made to the subdomain.