Hi Ganesh,
This is very much possible. All you need to do is either download data to a Flat File and upload this data to your transaction infoobject by creating separate transformation from this FF to your Infoprovider.
Otherwise, you have to write a ABAP code to flatten your hierarchy in the field routine of your DSO transformation.
There are lot of codes available in SCN. Please search with "Flatten Hierarchy Structure" in google or in SCN search.
Regards,
Suman