Sep 23, 2010 07:41 AM|sjnaughton|LINK
Hi Maan1978, there is no easy way to do that you want a dynamic Sitemap, I think if I were you I would write a custom menu that does this as this is a cascade on the master page.
I suspect what you want is
Buildings -> Units -> Family ->
Where buildings shows a list of Buildings and then Unis is filtered by Building etc. it should not be too hard to do though there are plenty of tutorial on the Menu control.