Nested Master Page

Master pages can also be nested, an arrangement in which one master page references another as its master. For example, we can have one master page that includes the logo and primary navigation for the site, a second master page that has a two column layout, and a third master page that has a three column layout. Each of the master pages that has a column layout can be attached to the main master page, in order to display the common logo and navigation from that master.