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Route a pipeline like the one shown below.
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Select Edit > Select > All to select all the components of the pipeline. Alternatively, create a select set. See Selection techniques.
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Select Cut
on the Edit toolbar to remove the original selection from the sketch when you paste the copy in
a different location, or select Copy 
to retain the original selection in the sketch when you paste the copy in a different
location.
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Select Paste
.
The software displays a representation of the pipeline selection and the rotation axis in black and white.
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Press the SPACE BAR.
The software displays the pipeline representation around the E/W axis.
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Click once in the Detail window to place the mirrored pipeline.
The software always mirrors the selection around the E/W axis. If you need to mirror
around the N/S axis, you must use a combination of the mirror and the rotate functionality.
First, rotate the original pipeline 180-degrees, and then mirror the resulting pipeline
about the E/W axis, which is the equivalent to mirroring about the N/S axis of the
original pipeline.