This plugin allows you to specify a specifc excerpt for WordPress pages.
The plugin adds an extra box to the set an Optional Excerpt for a WordPress page similar to the box which is available for posts. The box is aded using the dbx_page_advanced hook for versions of WordPress earlier than 2.5 and using add_meta_box() for WordPress 2.5 and later.
- Why would I use this plugin
If you want to add a hierarchical set of pages to your site you will probably want control over the excerpt used when displaying a menu list of pages.
A good system can be achived in conjustion with my PJW Query Child Of plugin (https://wordpress.org/extend/plugins/pjw-query-child-of/) which helps you build post queries to select children of a specific page.