I am trying to utilize a custom comparison parameter. It works as such... when you select 'Prev Month' in this parameter then is showing data for the Prev month (8/1/25-8/31/25) vs (7/1/25-7/31/25). I also have selections for QoQ ,MoM, YTD/QTD/MTD vs LY

BTW if you are using fiscal dates (not calendar dates) the process is much more complex see https://jimdehner.com/2022/10/14/fiscal-calendar-ytd-and-pop/