Unfortunately, no.

Actually, that one you can do by manipulating fields that are already there.  There is a default in SD-M for "Display Discounts on Forms".  If it is N then the unit price field that prints on the form is a calculated field with the discount applied.  If that is all you want then just change the default.  If you want to show the original unit price, Discount and Discounted unit price and extension then set the default to N so the discounted price gets calculated and add the fields to the forrm for the unit price from the BKARINVL table (undiscounted) and move the field for the discount itself out of the region box that is controlled by the default (delete the box and put the discount field back in the RTM