I've created a query with Start Date and End Date parameter so that when someone enters the start date and end date it will extract data in between those dates. Now the extracted data has 2 columns one for reason and the second column for downtime. I would like to add downtime for same reasons instead of having many rows. I tried using Group By SUM in the query but is showing an error as a complicated expression; simplify it. Can someone help me with this?