Count Records-Fields

Hi
I want a little help to do something. I have a crystal report and i took some records. I want to count that records with a field. Now i have 3 different group of records and i want in every group my counter start from the beggining. For example


Income
count
1
2
3
4

Spend
count
1
2
3

How i can do that?

One way :

Right click over field to count
Select Insert
Select Summary
Display an Insert Sumamry box
Select "Count" in "Calculate this Summary"
Select "Summary Location" ---> here choose the desired group footer section
Click OK