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When you create a new feature, the system automatically selects default Sketcher references. You can change these references or create new ones in the References dialog box or by pressing ALT and selecting one or more background entities. Any valid geometry is automatically added as a reference.
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• It is important to specify the right references before sketching so that Sketcher can create appropriate dimensions and constraints to position the section with respect to the part or assembly geometry.
• If you select Sketch before selecting sufficient references, Sketcher issues a warning.
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