Child menu

if ( ! function_exists( 'custom_navigation_menus' ) ) {

// Register Navigation Menus
function custom_navigation_menus() {

	$locations = array(
		'Gallery' => __( '', 'text_domain' ),
		'Manage Images' => __( '', 'text_domain' ),
		'Setting' => __( '', 'text_domain' ),
		'Additional setting' => __( '', 'text_domain' ),
	);
	register_nav_menus( $locations );

}
add_action( 'init', 'custom_navigation_menus' );

}