Custom Post Type UI

For advanced websites. This plugin allows you to designate new content types, beyond the standard posts and pages.

Settings

If you get 404 errors when viewing your custom post types, go to the menu Custom Post Types > Manage Post Types, then edit the Custom Post Type(s). Go to “View Advanced Options,” change the value for “Hierarchical” to “True,” and click “Save Custom Post Type.”

For more information, see the plugin page(s):
http://wordpress.org/extend/plugins/custom-post-type-ui/