LOCATE FOR rec_Id = m.MyId
LOCAL loScatter
SCATTER MEMO NAME loScatter
APPEND BLANK

#IF If you have a Default functionality to fill primary key
   * take the id generated by the default functionality during APPEND BLANK
   loScatter.rec_Id = rec_Id
#ELSE
   * changing the primary key
   loScatter.rec_Id = <whatever>
#ENDIF

GATHER MEMO NAME loScatter