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This action is used to add extra submenus and menu options to the user admin panel's menu structure. The function associated with this action runs after the basic user admin panel menu structure is in place. For example, the function might call add_submenu_page to add a sub menu page.
<?php add_action('user_admin_menu', 'function_name'); ?>
where "function_name" is the name of the function to be called.