Select-Single - Dynamically add and group data

Content

Hi, 
   
   I have a requirement to group together certain criteria that the user selects based on how the user chooses to group them.     
   
   So for example in my sample app, I have used locations and it could be something like - 
   
   Location = "Texas" and Location = "California"   ( This would be Group 1 ) 
   
   OR ( conditional clause ) 
   
   Location = "New Jersey" and Location = "Washington" ( This is Group 2 ) 
   
   So the first two select-single drop downs are Group 1 and then then next two are Group 2. But then when I try to insert a row in the middle , say to Group 1, the data does not shift correctly with the right indexes and values.