There is easy way to exclude certain pages from your wordpress page menu list by using Exclude Pages wordpress plugin.
This plugin adds a checkbox, “include this page in menus”, uncheck this to exclude pages from the page navigation that users see on websites or blogs. Go to wordpress plugin directory to download and proceed to install.
1. Download the “Exclude Pages” Plugin
2. Upload exclude_pages.php to the /wp-content/plugins/ directoryon your blog
3. Activate the plugin through the ‘Plugins’ menu in WordPress
4. Uncheck ” Include this page in lists of pages” to exclude pages from your page navigation list
5. Click update to finish