order management cancellation

i create sales order and booked ,now i decrement the sale line quantities is it considered as cancelled of quantities i decremented . for example i booked line with 10 quantities now i decrement the 5 quantities is it mean that remanining is cancelled ...

No in oracle terms As per

No in oracle terms As per your example, customer has ordered 10 quantities. After that the customer called you & said I want to cancel 5 quantities (reduced by 5). You ‘ll reduce the line qty to 5 if it’s not picked. If the customer says I want to cancel all the 10 quantities then you can cancel the line.