Using an example, a vendor has a default discount percent of 5%, and they (or the scrip center) run a promotion allowing you to buy it at an 8% discount.  Some scrip programs like to keep all of this extra profit instead of passing it on to the family.  In this case, you would enter the scrip at 5% (so that any family that buys it will get credited at 5%).  Then under Program Credits, create an Credit Type account called "Discount Savings" and put the remaining 3% (calculated in the form of a dollar amount) in as a credit.  This becomes a profit to the program and will be displayed when you run a Profitability Summary report.