Hi Chandra,
How many Months worth of data are you bringing in the report and how are you doing it? Do you want to update the query to bring the data dynamically for certain periods? If yes, try this:
CUSTOM PREDEFINED DATE RANGE FILTERS (WTD/MTD/QTD/YTD) in BO
And for the formula in Webi, try this:
Date Variables in Web Intelligence
Thanks,
Mahboob Mohammed