Crystal Report question - how to get check, month, quarter, and yearly totals

I need to create a payroll report that pulls current, month to date, QTD, and YTD deduction totals from PAYDEDUCTN, grouped by process level and deduction code.

Ideally, this report would look like this

Process level

100

Deduction

Federal – T000

YTD 1,000,000

QTD 277,777

MTD 80,000

9/21/07 40,000

Process level

200

Deduction

Federal – T000

YTD 2,000,000

QTD 577,777

MTD 180,000

9/21/07 40,000

I am very close to this report using groupings and SUM(FLD, CONDFLD).  I built a parameter for PAYROLL-YEAR and have left the check date and quarter fields blank.  Entering them as part of my selection criteria make YTD=MTD=QTD=current pay period.

My problem is that, because I left them blank, I am getting all of the detail for each check_date as well as quarter.  I can post this

YTD 1,000,000

QTD 277,777

MTD 80,000

1/1/07 45000

1/8/07 47,000

all the way down to…

9/21/07 40,000

I have attached screen shots of the design view and the output.  My question is this: how do I basically suppress all non-current values while, at the same time, using their detail to drive YTD and MTD calculations?

Thanks!