shared variable fomrula to concatenate the child part string with some seperator then use that result to suppress the row using an instr() comparison of the row into the concatenated result

Lets take the scenario with 3 groups to better understand.
Child part 1234 is present in all the groups so it is suppressed under respective groups but displayed on top where as child part 2345 is only present in 2 groups so its neither suppressed nor displayed on top.

Current Scenario:
GH:952(Parent Part)
Detail 1234 (Child Parts)      
          3456 (Child Parts)
          4567 (Child Parts)
          2345 (Child Parts)

GH:872 (Parent Part)     
Detail 5678 (Child Part)
          6789 (Child Part)
          7890 (Child Parts)
          1234 (Child Parts)
GH:850 (Parent Part)     
Detail 5432 (Child Part)
          9876 (Child Part)
          0987 (Child Parts)
         1234 (Child Parts)      
         2345 (Child Parts)


Proposed Solution:
GH#Custom-Name
          1234
GH:952(Parent Part)
Detail 2345 (Child Parts)
          3456 (Child Parts)
          4567 (Child Parts)
GH:872 (Parent Part)     
Detail 5678 (Child Part)
          6789 (Child Part)
          7890 (Child Parts)
GH:850 (Parent Part)
Detail 2345 (Child Parts)     
          5432 (Child Part)
          9876 (Child Part)
          0987 (Child Parts)