We can define macro by apply statement DEFINE ... END-OF-DEFINITION.

Example

DATA: itab TYPE TABLE OF sflight WITH HEADER LINE.
RANGES: r_carrid FOR sflight-carrid.
DEFINE append_range.
  &1-sign = &2.
  &1-option = &3.
  &1-low = &4.
  append &1.
END-OF-DEFINITION.
INITIALIZATION.
  append_range r_carrid ’I’ ’EQ’ ’AA’.
  append_range r_carrid ’I’ ’EQ’ ’AB’.
START-OF-SELECTION.
  SELECT * FROM sflight INTO TABLE itab
           WHERE carrid in r_carrid.
  IF SY-SUBRC = 0.
    LOOP AT itab.
      WRITE:/ itab-carrid, itab-connid, itab-fldate.
    ENDLOOP.
  ENDIF.

Note: You can define parameters only 9 (&1 ... &9).