Routine Query

Hello, I have a query regarding some abap routine in transformation. I have data coming like this from ECC:

Customer     Adr1     Adr2     Adr2

Sharma        1009    

Sharma                   1023

Sharma                              9021

Ok,

Now what I want to do is if customer is 'Sharma' then put all addresses in one row. how is it possible? I created a DSO and made all four my key fields and then i wrote field routines but it is still showing data like this. do I need to write end routine to assign them to their respective fields?

Please help.

Thanks.