Campaign Discounts

Hi Gurus

Is there a way to split and apply the campaign discount only to specific quantities on line items ?

Referencing the campaign discount at item level is effecting all the quantities.

Is it possible via std configurations? If not, Could you please suggest a logic to achieve it?

Example Scenario

Line 1 - SKU001 – Qty 5 – (Apply discount to only 2 of 5)
Line 2 – SKU002 – Qty 3 – (Apply discount to only 1 of 3)

Thanks

Kiran