To Apply a Parallel Constraint in the Content Editor (AutoCAD Mechanical Toolset)

In the Authoring Palettes window, in the Geometric tab, click Parallel.
Select the two objects to be made parallel. You can select either a line object or a polyline subobject.
The second object is made parallel with the first object.

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To Apply a Perpendicular Constraint in the Content Editor (AutoCAD Mechanical Toolset)
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Commands for Authoring, Publishing and Distributing Content Libraries (AutoCAD Mechanical Toolset)