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Sketch a base plane curve on the Inputs layer using the Curve
command.
-
Lock the base plane curve using Lock
on the Relationship toolbar.
-
Click Associative Offset
on the Change toolbar.
If Associative Offset does not display on the toolbar, you can right-click the toolbar and click Toolbars > Customize > Manipulation and then drag the Associative Offset command to the toolbar.
-
Select the base plane curve.
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Drag the offset curve below the base plane curve.
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Sketch the sides and top of the slot on the Default layer. For more information, see Sketch and Constrain Slot Geometry.
-
Extend the sides of the slot to the offset curve using the Extend to Next
command.
-
Click Trim
> Custom Curve Trim 
on the Draw toolbar to trim the offset curve to the sides of the slot.
Do not use Trim to trim the offset curve.
-
Click the constraint symbol on the offset curve. The Associative Curve toolbar appears.
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On the Associative offset toolbar, type a small value to offset the curve slightly below the base plane curve.
