You have to log in to to your account:

You create a product : How to create/import products

Then you can attach many values to it. By 

1. Press "eye" symbol on product. You will see it when you scroll to very right.

2. From there you can edit it, Press on pencil symbol.

3. As you can see in the picture below, you have price for 1 Unit and you can create automatic values when someone orders 10 and more, price is going to be with discount. When someone orders 50 and more, discount is going to be bigger. 

It depends what discount politics you are using at your company. By creating values like this, you reps are saving time and making customers happy by saving saving time and calculating discounts while making orders.