Years ago we established commission dependent on the customer discount code. Now I can not find where this is set up  

Hi Lynn,
I am a little puzzled by your response. as you can see from the following, there is a relationship set up between the DISC% and the Comm% when running the Commission Detail Report. It is this relationship i need to work with. (I truncated the report to show only a few lines)
Cust Name             Cust PO         Item Number     Date      Invc#    Quantity         Price     Disc%     Comm%     Sale Amt   Commission
HYATT'S GRAPHIC  B156430           205M-BP         04/01/13 413951       24.00        5.9900   62.50     5.0000        53.91         2.70
ESSEX CARD SHOP, ESSEX327        25                 04/02/13 413964        6.00        9.4900    50.00   12.0000        28.47         3.42
ESSEX CARD SHOP, ESSEX327        700-12A         04/02/13 413964        6.00       11.5900   50.00   12.0000        34.77         4.17
ESSEX CARD SHOP, ESSEX327        957ABP          04/02/13 413964        6.00        3.9900    50.00   12.0000        11.97         1.44
ESSEX CARD SHOP, ESSEX327        944BP            04/02/13 413964        6.00        3.9900    50.00   12.0000        11.97         1.44
ESSEX CARD SHOP, ESSEX327        9405ABP        04/02/13 413964        6.00        3.9900    50.00   12.0000        11.97         1.44
ESSEX CARD SHOP, ESSEX327        525BP            04/02/13 413964        6.00        3.3900    50.00   12.0000        10.17         1.22
RAINBOW ACE HARD 4813              10                  04/16/13 414100        6.00       10.9889   55.00   10.0000        29.67         2.97