Another running total problem

[1994mkiv]

First of all here is how my report looks like

Labor hours Employee ID
Date
01/01 5 100
10 101
Sub total 15

01/02 8 100
2 103
Subtotal 10

01/03 15 102
3 103
subtotal 18

Grand Total 43

The report is grouped by the date. Beside the daily subtotal I want to need to see a total labor hours up to that date.

 

[1994mkiv]

Thanks any way, Solved the problem by using the running total fields in field explorer