Does anyone know of a way that I can move where a site displays in the
navigation menu based on the value of the field?

We have three project status' - Startup, Production and Closed. I
have three navigation menu headings with the same. I'd like to have
the links to the sites for the projects that are in startup appear
under that heading, and so on. Right now, I know it can be done by
manually moving the sites through the site navigation. But is there
anyway to automate this type of thing?