[Chimera-users] transposing a pdb structure ("copy & paste")

Dear Chimera fans and team, I have a pdb file of a fragment of an amyloid fibril constructed of 8 layers (8 parallel strands of beta sheet). I would like to overcome the end effects when modeling it, so I would like extend the existing structure by duplicating it at its end. Does Chimera has a tool do the following: duplicate existing pdb molecule coordinates, position the duplicated molecule at a desired location, and then align it reasonably with respect to the original molecule? Thank you very much for your time and help. Ben