With so many options, the user wants to make sure that discounts are set to reflect the pricing to the customers they are trying to target.
The following is the price book hierarchy. The higher level will supersede any price books set at the lower levels regardless of discount.
If the Customer level price book discount is 10% and store level price book discount is 20%, the customer level discount of 10% will apply, even though it is a small discount. The hierarchy determines which price book is in effect, the amount of the discount is not a factor.
CUSTOMER Level (HIGHEST LEVEL) - If a discount is applied at the customer level it will be the price book discount applied to the item. No other discount will apply
STORE Level - The store level price book discount will be applied if a venue or item level discount is also in effect
VENUE Level - The venue level price book discount will be applied if an item level discount is also in effect
ITEM Level - Any other price book will be applied over this discount