Something like this would do it
add_action('admin_menu', 'add_options_pages');
function add_options_pages() {
if (!function_exists('acf_add_options_page')) {
return;
}
acf_add_options_page(array('page_title' => 'Theme Options'));
// the following parent url will be auto generated by the above call
// you can change the slug by specifying a slug for the page
$parent = 'acf-options-theme-options';
$sub_options_pages = array('Header', 'Navigation', 'Banner', 'Etc');
foreach ($sub_options_pages as $title) {
acf_add_options_sub_page(array('title' => $title, 'parent' => $parent));
}
}
edited, didn’t need $options_page = on this line acf_add_options_page(array('page_title' => 'Theme Options'));'
