Content Type Scope
The site in which you create the content type determines its scope. A site content type becomes available to any child site of the site on which it was created.
The following figure presents an example of the scope of content types created on a hypothetical SharePoint site collection. Site content types created at the root site of the collection, the Planning site, would be available not only for its direct child sites—United States, Europe, and Asia—but also for all sites further down the site hierarchy, such as England, Japan, and the Press Releases list. Site content types created at the Europe site would be available for the England child site and the Press Releases list it contains, but not the Japan site, because it is a child of the Asia site, not the Europe site.
For more information about site and list content types, see Site and List Content Types.