cmod code for data extractor enhancement

hi guys i need some help writing some abap code

the requirement is to enhance the datasource to show data..i have data like

1 b john etc...

1 c john etc..

1 d john etc...

the data belongs in the same structure. .. the structure has 15 fields and i could append the structure with a new filed to hold the concatenated value of b, c, d.

i need it to written out in the data source as

1 line showing

1 b c d john etc.......

delete the rest of the extra lines..

any ideas.?