The offset curve allows the base of a collar connected to the base plane to adjust to the shape of the supporting structure in the model. These steps are only required for a collar connected to the base plane.
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Sketch the collar on the Default layer.
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Click Offset on the Change toolbar.
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Select the base plane curve.
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Drag the offset curve above the base plane curve, and click to place the curve.
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Type a value in the Step distance box to offset the curve so that it is visible above the base plane curve.
This gap accounts for fit up clearance
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Sketch the sides and top of the collar. For more information, see Sketch and Constrain Collar Geometry.
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Extend the sides of the collar to the offset curve using the Extend to Next command.
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Click Trim > Custom Curve Trim on the Draw toolbar to trim the offset curve to the sides of the collar.
Do not use Trim to trim the offset curve.