/**
* Hook: woocommerce_before_single_product_summary.
*
* @hooked woocommerce_show_product_sale_flash - 10
* @hooked woocommerce_show_product_images - 20
*/
do_action( 'woocommerce_before_single_product_summary' );
add_action()
, а убираются с помощью remove_action()
remove_action( 'woocommerce_before_single_product_summary', 'woocommerce_show_product_sale_flash', 10 );
remove_action( 'woocommerce_before_single_product_summary', 'woocommerce_show_product_images', 20 );