Crystal Reports Running totals on groups

Message

I have a report for Daily Bookings by Brand [X, Y, Z]. I grouped the booking dollars by day.1/1/2013 $25.00 X
1/1/2013 $25.00 Y
1/1/2013 $25.00 Z
1/2/2013 $50.00 X
1/2/2013 $50.00 Z

I have a running total for Daily and suppressed the details
1/1/2013 $75.00
1/2/2013 $100.00

Now I need a running total for the YTD Bookings
1/1/2013 $75.00
1/2/2013 $175.00

I can't do a running total on the running total so how would I accomplish this?

Thanks in advance-
Minco