Add Settings Page to Custom Post Type

snippet.php

<?php
//Example from Codex page : http://codex.wordpress.org/Function_Reference/add_submenu_page
//Add this in your functions.php file, or use it in your plugin
add_action('admin_menu', 'register_my_custom_submenu_page');
function register_my_custom_submenu_page() {
  add_submenu_page( 'edit.php?post_type=book', 'My Custom Submenu Page', 'My Custom Submenu Page', 'manage_options', 'my-custom-submenu-page', 'my_custom_submenu_page_callback' ); 
}
function my_custom_submenu_page_callback() {
	echo '<div class="wrap"><div id="icon-tools" class="icon32"></div>';
		echo '<h2>My Custom Submenu Page</h2>';
	echo '</div>';
}