Purchase Print Of Gross Price?????

HI all

I am currently facing a problem while taking a P.O print

I want to print the Gross price Only excluding the Discounts.

For Eg.,

PB00 (Gross price) = 100

R002 ( Discount) = 10-

Net Price = 90

Currently i am able to print Net Price only at line item level (90)

I want to print Gross price = 100

and then the Discount as = 10-

How will i be able to acheive this in my Calculation schema.