hi vijay,
Field-symbol: <fs> type any.
DATA: l_index TYPE sytabix.
DO.
l_index = l_index + 1.
ASSIGN COMPONENT l_index of ITAB1 to <fs>.
IF sy-subrc = 0.
ITAB2-field1 = <FS>.
APPEND ITAB2.
ELSE.
EXIT.
ENDIF.
ENDDO.
this is the logic....
hope it helps...