Kraft

There are so many of them. Let me just suggest two:

Discounts on titles (material only - it is not custom to discount labour, well at least this was the case for centuries in germany)

Wish Price, i.e. you offer a total of 15.987,98€ gross sum. The customer tells you to give you the order confirmation right away if you quote 15.500,00€. You can either add a discount position of -487,98€ (minus tax) or change the total price to 15.500 and Kraft spreads the discount equally on all material positions.