DSXchange

use file pattern and after that extract filename the file . Use this filename in transformer constraints to segregate the records ..in derivations use these n add another column ..

Thank a lot for ur reply.

Could u pls explain in detail... im new to DS

Which part is unclear? Always best to ask specific questions.

First ensure you can read multiple files, have you tried using the File Pattern yet? Also there is an option in the stage to add the filename as a field, enable that. That way you can check the value in a transformer to decide how to populate the derived field you add there.