Thank you for your reply.
For question 1 : Ok thanks, i tried it and seems really good. Just i don't find the solution in your documentation to add all my products to all my suppliers. Because i have 5 suppliers where i can buy the same products.
For question 2: In France, a company like mine, enter the cost of goods without VAT, because we do not pay it. To clarify, we pay it but we also collect it. When I bought products from my wholesaler, I always see the cost without VAT, that's why I would like to know if it is possible for this cost to stay in the product without VAT.
Thank you in advance.