Help System (web edition)

ALT-F3:COPY LINE
  COPY LINE copies a line to the current cursor position.
  (Prompt 'Line to be copied?' appears on the bottom line.)

  When copying lines in a large edit field (long line numbers)
  a line to be copied can be temporarily marked by pressing F2 -
  and then it can be copied to any other line by giving character -
  as a line label.

  (As suggested by Reijo Sund) several lines (lines L1-L2) may be copied
  entering in the prompt:
    Line to be copied? L1,L2