Hi Remi,
You can try like this:
I have given a some suggestions i.e You just take one parameter only because u can imagine 3 columns previous data display correctly i.e From Date
Month parameter is also a alternate option.
For Ex: Column1: From Date - 90 Days/3 Months - we get the three months previous data correctly etc.
Finally, create a stored procedure that returns the required columns and does all the calculations on the database side.
Follow abhilash suggestion as well.
Useful threads: Crystal Report Parameter Issue
Month to date data for Previous month
How to find current month, previous month Net Sales by means of formula?
Thanks,
DJ