Group in a Group like sub groups

[jasperlady]

I want to implement some thing like below how would i do that

 

Courses:

Java:

Servlets

Struts

Spring

HIbernate

Reporting:

Jasper Reports

Crystal Reports

Microsoft Report Viewer

Hardwate

Tools:

XXXXX

XXXXX

Machines:

XXXXXX

 

and here java and reports are sub groups for main courses group.In the courses group footer i need display count as

2 and in java sub group footer i want to dispklay the count as 4

 

I tried this one by defining two groups and offcourse thats not working

 

does anyone know how to handle this

[jasperlady]

any help would be appreciated