Inclusind a new field in internal table

Dear All,
I am a newbie to abap world.
I wish to clarify if there is some way like
data: itab like mseg
In addition to the mseg table structure i want to add a new field to same.
I tried something like
data: itab like mseg,
        field like transparenttable-field.
but it doesnot work.I want i should be able to refer itab-field without any compilation error.

Hi Aditya Sharm
Please try this code just copy and execute it it will work.
Sont forget to reward points.
REPORT  ZBC12.
Tables mseg.
data  begin of itab occurs 0.
include structure mara.  " -> In addition to the mseg table structure adding new field of other structuredata MBLNR like mseg-mblnr.
data MJAHR like mseg-mjahr.
data ZEILE like mseg-zeile.
data end of itab.
Populating itab*
itab-MBLNR = 1011.
itab-MJAHR = '2008'.
itab-ZEILE = 4.
itab-matnr = 4444. " -> Populating the field using itab-manr as control knows itab as its table
append itab.
Displayig itab data on screen
loop at itab.
write:/ itab-MBLNR,itab-MJAHR,itab-ZEILE,itab-matnr.
endloop.

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