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

In the Authoring Palettes window, in the Geometric tab, click Colinear.
Select the first and second object. You can select either a line object or a polyline subobject.
The second object is made colinear to the first.

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To Apply a Perpendicular Constraint in the Content Editor (AutoCAD Mechanical Toolset)
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To Apply a Vertical Constraint in the Content Editor (AutoCAD Mechanical Toolset)
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To Apply Multiple Geometric Constraints to an Object in the Content Editor (AutoCAD Mechanical Toolset)
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Commands for Authoring, Publishing and Distributing Content Libraries (AutoCAD Mechanical Toolset)