Contour Selection
Select sketch contours and model edges, and apply features to them. This allows you to use a partial sketch to create features.
Sketching in 2D
To select and extrude contours:
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In an active sketch, select a feature to apply the selected contours. For example, click:
to display the appropriate PropertyManager.
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In the graphics area, use the pointer  to select a contour for Selected Contours.
 The contour can include model edges.
To select multiple contours, hold down Ctrl.
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Click  to apply to the selected contours.
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Extrude
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Revolve
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A tooltip appears when you cannot select a contour because:
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Contour selection is also restricted as follows:
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When reusing a sketch, you can select only on the original face. If, for example, part of the face has been extruded, the tool does not recognize the new face.
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You can select contours only on the face with the sketch. If, for example, the face with the sketch is cut by a solid object (as shown at right), the tool can select the part of the face still visible but does not recognize the solid object.
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Sketching in 3D
When creating lofts with 3D sketch contours as opposed to individual sketches, you can select one or more contours.