Option to turn off % off MSRP on the client invoice

Is there a way to not show the % off MSRP on the client invoice. If not there should be so we designers can decide which clients/invoice we need to show what discount they are (or aren’t) getting. We currently have to remove the MSRP from the item itself in order to not show that to the client however, it’s still important to the designer to understand their markup ability on the item without disclosing the discount to the client. In addition some clients wonder why it’s 10% off one item but 40% off another - typically a discussion that’s unnecessary.