Hi Siddharth,
I assume you want to pull data for last 6 Quarters from the database, and for that you need a dynamic filter which can do that. Is that correct? If yes, we'll to need to know what is the backend database you're working with, to create a filter that gets data for last 6 Quarters, as functions and syntax differs by database.
Example: For Oracle, filter to get last 6 Quarters would be like:
<Table.DateColumn> between trunc(add_months(sysdate,-18),'MM') and sysdate
Thanks,
Mahboob Mohammed