Price customization

[pgauthier72]

I have a product that I sell by linear foot and more long is less expensive is the price. The best way I found to do it is the specific prices directly in the creation of the product by mentioning that has each increase of the amount decreases the price of "x". The problem is that it automatically generates in the basket, at the time of post, a small red square indicating a % discount equivalent to the $ decrease . in fact because this isn't really a discount as such but rather a volume price. Is  there a way to remove this mention of rebate  or even another way to put different price by linear feet if you want to manage it by quantity and not by the attributes?