(magento 1) How can i activate an incremental discount in a single typology of product? I can't find tutorial on how to set the rule. Ex: one product price normal, 6 piece 5% discount, 12 pieces 10% discount. Thanks a lot fo help.
A cart rule does not require a coupon code, and can, therefore, be automatically applied to items in the cart. In terms of conditions that apply a discount, you can use logic statements to determine that if there are Greater than "x" items in the cart but fewer than "y" items that match a particular category or attribute, the promo should apply.
You can then specify the discount % as an Action. In the Actions tab, be sure to specify which products the discount should apply to (ie. only products in the cart that match an attribute or other criteria), or the discount will apply to everything in the cart.
Be sure to test your rule. In the example you shared, you'd definitely need to create multiple rules (one for 6 or more pieces, another for 12 or more pieces, etc.).