Report Trigger OnAfterGetRecord and Form Trigger info?

Hi,

I have created one report based on Item Data... and on OnAfterGetRecord written below code..


CLEAR(A);
CLEAR(B);
SL.RESET;
SL.SETRANGE("No.","No.");
IF SL.FINDSET THEN BEGIN
SL.CALCSUMS(A);
A:=SL.Quantity;
SL.CALCSUMS(Amount);
B:=SL.Amount;
UNTIL PSL.NEXT = 0;
END;

I have create one list form and same A and B Variable.... and I want to achieve the same..
on which trigger I have to write the code in form in order to achieve the same...