Hi Ujwala,
As we discussed over personal messages of OS, i am not able to handle the functionality of drop down inside the table, coz when we select the value of drop down in one record , it is reflecting to the all of the drop down of table and it get removed from the list but it won't display in selected drop down as well,
here is the OML of selecting particular field based on field attribute,
Regards,
Komal