I can add an order item from the cart by doing this :


Is there a similar way to delete a product line from my cart ?


Orders have a removeItem method defined on their interface. You just need to pass the loaded order item to that method, and then delete the orderitem.

 * Removes an order item.
 * @param \Drupal\commerce_order\Entity\OrderItemInterface $order_item
 *   The order item.
 * @return $this
public function removeItem(OrderItemInterface $order_item);

See how the commerce_xquantity module does this: https://github.com/drugan/commerce_xquantity/blob/8.x-1.x/src/Entity/XquantityOrderItem.php#L318

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