Adjust Multiple Group Header With Multiple Details Section

Question

I have crystal report project In C#-2005 as Below:
There are Two Group Header Like:
Category 1  // this is on Group Header #1
Catagory2   // this is on Group Header #2
I have Field Like Below:
On Details Section1 Details a
Name
Amount
On Details Section2 Details b
Name
Amount
Now the out put of the report is  OR Preview of Report is like below:
Category 1  
Catagory2   
Mahesh
Mahendra
Kirti
Mahesh
Mahendra
Kirti
My demand for output is like below:
Category 1  
Mahesh
Mahendra
Kirti
Catagory2   
Mahesh
Mahendra
Kirti


How to design Crystal Reports