Thanks a lot for all.. by your suggestions i reached the requirement and done it as below.
Thanks again.
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MODULE USER_COMMAND_0100 INPUT.
CASE sy-ucomm.
WHEN 'CREATE'.
call transaction 'IW21'.
WHEN 'CHANGE'.
call transaction 'IW22'.
WHEN 'LIST'.
call transaction 'IW28'.
WHEN 'CREATE1'.
call transaction 'IW31'.
WHEN 'CHANGE1'.
call transaction 'IW32'.
WHEN 'LIST1'.
call transaction 'IW38'.
ENDCASE.
ENDMODULE. " USER_COMMAND_0100 INPUT
