Composite Curve
You can create composite curves by combining curves, sketch geometry,
and model edges into a single curve. Use a composite curve as a guide
curve when creating a loft or a sweep.
To create a composite curve:
Click Composite
Curve 
on the Curves toolbar, or click Insert, Curve,
Composite.
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Click the items (sketch entities, edges, and so on) that you want
to join.
The selected items appear in the Composite
Curve Property Manager, under Entities
to Join in the Sketches, Edges,
and Curves to Join 
box.
Click OK 
to create the composite curve.
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Select the edges on the model for the curve. |
Create the sweep profile sketch, then use
the composite curve as the sweep path. |
Here is the completed sweep cut. |