Page Organization in the Dashboard

I have a wordpress site I am managing and one of the pages has a lot of links on it that link to other pages. These pages are still part of the website but they are not in the main navigation. The only way to get to these pages is from one of my main pages. In the dashboard it would be nice to organize my pages so I know what ones are in the main navigation and what ones are pages that are just part of the site but not main pages. Wow, that’s harder to explain than I thought. I am just looking for a plugin to organize pages in the Dashboard because I am dealing with LOTS of pages and its getting overwhelming.