如何在快速报表4中为列总计设置值

how to set value for the column grand total in fast report 4

我有一个数据库交叉表对象enter image description here

enter image description here

我想为示例的列总计设置值: A+B-C-D-E-F-G-H-I = 总计

或 总计 = 总计 -A -B

尝试使用 cross' OnPrintCell 事件(总计 = 总计 - A):

procedure Cross1OnPrintCell(Memo: TfrxMemoView; RowIndex, ColumnIndex, CellIndex: Integer; RowValues, ColumnValues, Value: Variant);
begin
  if ColumnIndex = 0 then
    if Value <> null then 
      Set('Var0', Value)
    else
      Set('Var0', 0);
  if Cross1.IsGrandTotalColumn(ColumnIndex) then Memo.Text := VarToStr(Value - Get('Var0'));
end;