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Click Tools > Point Along
to display the Point Along Ribbon.
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Start the command to place the new object, for example, Place Tap, Insert Component, or Place Member.
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Click Reference
on the Point Along ribbon.
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Select the object along which you want to place the new object. This reference object can be a pipe or a curve, or you can select an E-, N-, or EL-axis (X-, Y-, or Z-axis).
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Select a point on the object from which to measure.
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Select the direction of offset measure from the Direction list.
Along object displays the distance along the object from the reference point.
E-, N-, or EL-axis (X-, Y-, or Z-axis) options display a distance or point in orthogonal directions using the active coordinate system defined for the workspace. You can define the active coordinate system using the PinPoint
or Measure 
commands.
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Move the pointer along the object to view the distance from the reference point. The distance appears both in the Distance box and in the active view.
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Click in the view to define the location of the new object.
Click Reference on the Point Along ribbon to select a second point that is not along the reference object.