There are a few different ways you can apply a discount within BPro. Here are the three most common ways that are used when putting an order/job together:
The green option is if you want to make either a percentage discount, or take a specific dollar amount off the unit price of an item you are selling to the customer.
The orange option is if you want to quickly change the default price to something else
And lastly, the red option is if you want to change the price for all the items in a cart