Click Sketch Curve
.
A Tools Palette is
displayed:

The following icons let you:
create a curve lying on the current view plane
-
create a curve lying on an existing plane (you need to select the
plane first)
Sketch a curve using the left-mouse button.
A temporary curve is displayed in the geometry area.

The Tools Palette is
displayed, allowing you to manipulate the curve.
Refer to Modifying and Deforming Curves Using the Tools Palette.

You can continue to sketch the curve in order to refine
or complete it.
The curve (identified as Styling Curve.x) is added to the
specification tree.

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