Use the Product's Discount Tab
Shift4Shop also allows you the option of setting discounts based on the quantities of products ordered. For example, you may want to offer your customer a discount on a particular item if purchased in bulk. This can be done in the product's Discount Tab which is the sixth tab on the product creation pages.
Quantity Pricing
Go to Products > Product List.
Select the item you'd like to set quantity pricing for and proceed to its "Discount" tab.
Click +Add at the top right and enter your first quantity range.
Specify the customer group pricing level the discounts will apply to*.
5. Specify your discount amount and type.
6. Click Add.
7. Repeat until you've completed your quantity ranges.
Once the quantity pricing is configured, your product will contain a graph showing your customers what the price ranges when the link is clicked.
Remember to keep your product's base cost in mind when offering discounts so you don't inadvertently sell your items at a loss. For simplicity, it may be best to use percentages rather than dollar amounts to specify your discounts.
Additional Settings
Beneath your bulk discount ranges, you will see two additional checkboxes. These can be used to determine how bulk discounts are applied to products with selectable options.
Group Options for Qty. Pricing: In our article describing the Discount Tab we discussed how to apply discounts on a product depending on the quantities ordered. By default however, the discount is applied to quantities of the item either without options or with the same options selected all around. In other words, if you have a shirt available in 3 sizes and 3 colors, and you offer a discount of 5% for orders of 3 or more shirts; the customer will have to select the same options for all three shirts in order to qualify for the 5% discount. However, the Group Options for Qty. Pricing setting in the product's Advanced Tab will make it so that the customer can place separate versions of the product in their cart - with different options selected on each - while giving them the specified discount after they reach the minimum amount of product required for the discount. (see image)
Apply Qty. Pricing discount to options
When using Quantity Discounts, the discount applied is deducted from the product's main price. By default, if the option being selected on the product has any sort of markup attached to its price, the quantity discount will not apply to it. By selecting this checkbox in the Advanced Tab , the Quantity Discount will be applied to both the product's base price and the option's mark-up value.