Nesting design

I'm a little bit further in understanding the structure stuff with settings and environment. Is there a way to have one environment rendered inside another one. In bigger sites you have nested layouts. As an example: Title -> navigation bar -> sub navigation bar 1 - component 1 -> sub navigation bar 2 - component 2 -> about section without nav bar To me it appears that in pier I would always have to provide the whole layout even if only component 1 and component 2 differ by the sub nav bars. So the environment for component 1 would include all stuff for Title, navigation bar and sub navigation 1 and component 2 would include all layout for Title, navigation bar and sub navigation 2 Or is there a way to nest them properly to have every single layout only once? Norbert