Fieldmanager_Field::add_submenu_page PHP Method

    public function add_submenu_page($parent_slug, $page_title, $menu_title = Null, $capability = 'manage_options', $menu_slug = Null)
    {
        $this->require_base();
        return new Fieldmanager_Context_Submenu($parent_slug, $page_title, $menu_title, $capability, $menu_slug, $this);
    }