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If you can add C2 round in sketch, it would be huge improvement to make the A class surface.
In WF4 if you have, for example two splines in sketch and then you create a fillet between them, you get the T sign for the tangent constraint, if you then apply an 'Equal' type constraint to the spline and the round you get a C sign for equal curvature between spline and arc (I assume this is still the same in Creo)
Or did you want something more than this??
That is an excellent tip, Charlotte. Never knew that. It does still work in Creo 2.0.
Welcome to the forum, Gang Hong.
It's not easy to contral the spline in VSS. Now, more and more industrial designer use Creo to build the high quality surface. But...
You have more options on the spline than 1st meets the eye. With the selection tool active, double click the spline. You can now change the spline control to the alternate drag handles, either dimensioned or constrained.
I would like a much more robust control of splines, but at least we have some options.
Most people who need industrial design level control of surfaces also have the appropriate surfacing extension. It has a lot more surface control features.