By this do you mean you want it to automatically create wp_nav_menu’s for each top level page, so you can use them as sub menu’s for that page?
I created a loop that goes through all the top level pages and automatically creates a sub menu in the new wp menu editor.
I put the following in my functions.php
<?php
$mypages = get_pages('parent=0');
foreach($mypages as $page)
{
$slug = $page->post_name;
$title = $page->post_title." Sub Nav";
register_nav_menus(array($slug => __( $title )));
}
?>
and then put this in my sidebar.php (or wherever you want the sub-menus displayed).
<?php
$mypages = get_pages('parent=0');
$count = 0;
foreach($mypages as $page)
{
$content = $page->post_name;
$title = $page->post_title." Sub Nav";
if(is_page($content) || is_child($content)) {
wp_nav_menu( array( 'container_class' => 'sidebar-subnav', 'theme_location' => $content ) );
}
}
?>
I also used the is_child plugin to make use of the is_child function so that the sub menu displays on the child pages too.
I hope this is what you meant, if not it might come in handy for others.
