>Actually, No. But maybe I am not asking my question correctly. I have the data structures. I can handle forms,queries etc. My question has to do specifically with reports. If I have 500 customers distributed between class 1 and class 2. The method CalcAmtDue is different for each class. In a report I want to show the result of CalcAmtDue for each customer. How do I do it? Thanks...

What prevents you from using simple way:
***CalcAmtDue method
LPARAMETER nCustid
IF SEEK(nCustid,"customer","id")=.F.
Return 0
ENDIF
IF customer.class=1
** one kind of calculations
ELSE
** another kind of calculation
ENDIF
RETURN nRetvalue