Exclude Subpages from being added to bar in MX4

If you want to exclude all subpages, wp_list_pages has a parametre depth (if you set it to 1, it’ll only show the top level pages). If you want to exclude some and include some, you need to use the exclude parametre and list all the page IDs you want excluded.

An example of the very basic form of the template tag:
<?php wp_list_pages('title_li='); ?> – you should add:
<?php wp_list_pages('depth=1&title_li='); ?>