delivery mode virtuemart2.0.10

[glouglou]

Hello
I sell books which weigh 3,5kg: the person orders 10 books with 250€ the book. I have create a mode of delivery colissimo to 10 €. I will want that in the purchase order for the delivery mode I have the price 10€x10books=100€. If not all the remainder functions with wonder.
Thank you in advance