Piping Input menu: Global >Duplicate 
Block Operations toolbar: Duplicate
Duplicates elements in a block.
Displays the Block Duplicate dialog box. You can make identical copies of the block. You can also make a mirror image by flipping the chosen elements in one of the orthogonal planes. Mirror imaging is done on the piping delta dimensions only. That is, restraints are copied but not mirror imaged. A +Y restraint does not become a -Y restraint when mirrored in the XZ plane.
Setup
Restraints, displacements, forces/moments, uniform loads, nozzles, flanges, and element characteristics can be individually included or excluded from the duplication.
After the type of duplication is determined, you must decide the following:
Where in the Elements List to put the duplicated group of elements, either at the end of the current block, the end of the input file, or after a specific element in the model.
What node increments to add to the nodes in the block so that they define unique pipe elements. Be sure this increment is large enough to avoid any duplication of node numbers.
For more information, see Performing Block Operations.