Item and Group Level Discouns

In Handoff, I can only provide an estimate level discount. I want to provide item level discounts and group level discounts - typically on cabinets. I want my customer to see the original retail price and the discount they are receiving just on cabinets. In handoff I can ask the AI to add a discount to the group but it ended up marking it up. I also cannot add a negative sign if I wanted to manually add the line item discount to the group.