I have a layout page and some pages that use it. But I want to implement a navigation control on some of the sub-pages that use it. So I want to use another nested layout page.
You can solve this easily enough in one layout page by using sections.
check http://weblogs.asp.net/scottgu/archive/2010/12/30/asp-net-mvc-3-layouts-and-sections-with-razor.aspx