Crystal Reports Blank rows in report suppress

Message

   Hi
I have tried to read threads but still having issues with removing blank rows from data.  I have created an Indented Bill of Material with everything properly link. I have 5 groups for the various levels with Parent linked to component for each of the tables.

Group A  Comp_item
    Group B Comp_item
       Group C Comp_item

I am getting blank lines where no components are present.  It creates a blank row and creates a very long report. 

Current result
105112 
         105337
                Blank becuase no Group c component present
120328-001
          102236
              200053-01
              200092-01

I have tried suppress blank section,  I have tried formula {bmprdstr_sql_2.item_no}='null' for group section

Thanks for feedback.  I can send .RPT if desired.