Hello! 

I am setting up Products & Pricebooks for the first time and I am having some difficulty setting up formulas for discounts. 

Specifically, I have different products that can be discounted at the sales reps discretion up to a certain percantage (15%) and then they can request approval for up to 30%. I wanted to do the maximum discounts just in a formula field. I know I can make a validation for it but was told it would be better to do a formula?