I have created a matrix report. I have used three fields in group by say sales_stage, opportunity_name, opportunity->assinged to user -> first_name. Then I have displayed these fields in report summary fields. Now I want to add one more field in say sales_stage_date in report summary fields. But there is no option for that field because it is showing the field according to group by fields? So how can add this field in report. Is it possible?