Mr.Kumar krishna Sen,
If you had created table control with attributes Output only, then you recreate with option Input Control.
Then the table control wizard automatically creates a module (MODULE TC_8001_MODIFY ON CHAIN-REQUEST) to alter the itab contents in line with the table control contents.
If itab has no data initially and if you want to save the table control data into itab, you have to write the logic inside the above module.
MODULE TC_8001_MODIFY INPUT.
MODIFY ITAB
INDEX TC_8001-CURRENT_LINE.
if sy-subrc = 4.
append itab.
endif.
ENDMODULE.
