Unextend a Web application (Windows SharePoint Services)
Applies To: Windows SharePoint Services 3.0
On the top link bar, click Application Management.
On the Application Management page, in the SharePoint Web Application Management section, click Remove SharePoint from IIS Web site.
On the Remove SharePoint From IIS Web Site page, if the Web application that you want to unextend is not selected, then:
In the Web Application section, on the Web Application menu, select Change Web Application.
On the Select Web Application page, click the Web application that you want to unextend.
On the Remove SharePoint From IIS Web Site page, in the Deletion Options section, make the following selections:
In the Select IIS Web site and zone to remove list, select the Web site and zone within the Web application that you want to remove.
Under Delete IIS Web sites, select Yes if you want to remove the IIS Web sites used by this Web application. If you select this option, the IIS metabase entries referring to these Web sites will be deleted, even if other applications are using them.
Click OK.