Copy/mirror building elements in section or elevation window.

• Drag one or multiple copy of building elements (wall, roof, column, slab, mesh, objects...)
  or mirror them in a section or elevation window.
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• The new elements will be created parallel to the
  section or elevation line on the given floor plan.
• If you move elements between stories the newly
  created elements owner story will be remain.
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• This feature is part of the Archicad from version 17!
• This add-on is not included in our add-ons from this version.
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• OS: Windows, MAC OSX 10.4 or higher.

You can find the section copy Simple Add-On under the Edit menu: