Common Content

I searched and can’t find an answer, but what I need is basically a way to have a multisite page call a common page that is administered in 1 area. So, for example, the subsite may have “home/about/policies” as a menu. Home and About page content is local and handled by the subsite admin, but the Policies page pulls content from a central location – so that if that page is updated by the super admin, it is carried across all blogs that have a link to that page. I am guessing the answer is a plugin/shortcode that is placed on each multisite page and calls the common page. Any help would be greatly appreciated.