This is Regarding internal tables

Hi to all,

I have 3 internal tables like this.

it_itab1 It_itab2 it_final

! ! !

!-- f1 ! -f3 !---f1

!-- f2 ! -f4 !---f2

!---f3

!---f4

the fields are like this.now i want to move the data from first two internal tables to final internal table.

how to do this.

thanks and regards,

s