Construction elements are used to aid in the definition and proper constraint of the final symbol geometry. Because of the way sketched features are placed into a Draft 2D view, sketched feature symbols can be constrained using horizontal and vertical constraints.
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Make the Constructions Layer active.
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Place a point at the (0,0) origin of the 2D Symbols file, and then click Lock on the Relationship toolbar to lock the point.
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Define the necessary horizontal and vertical construction lines relative to the symbol origin.
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Define and constrain additional construction elements (lines, circles, and so forth) as needed.
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Make the Dimension Layer active.
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Dimension the construction elements to further constrain and aid in the definition of the geometry.
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Click a dimension in the graphics view, and type the new dimension value to adjust.