Recalculation of advanced pricing discounts at the time of invoicing

Hello,
Is there a way to apply a discount when printing the invoice?
The issue is that when a discount is applied based on quantity—for example, a 10% discount for quantities over 1,000—the customer still receives that 10% discount even if only a partial quantity (e.g., 10 units) is confirmed.
If not, how can this problem be resolved?
Thank you for your support.