A may become out of date, seldom used, or, for whatever reason, no longer useful. For example, a project whose information was published on a company intranet has ended or been reorganized. Or, a subscriber who posted a to an Internet service provider's Web server has discontinued service. In these cases and others, you may need to delete the subweb.
When you delete a subweb, you delete all of its contents, files, folders, and nested subwebs, as well as remove its FrontPage Server Extensions. You cannot undelete a subweb.
To delete a subweb
Note
If you do not have permission to delete a subweb that is nested below the subweb you are deleting, the nested subweb will not be deleted.