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stretch a curve outside sketcher

In NX Sketcher, a curve with Scalable Group constraint can be stretched freely by dragging its end points.
I wonder whether it's possible to do similar job on curves outside the sketcher. In Alias they have a command Curve Stretch for the job.
X-Form has an Advanced Method option --- Proportional. But it seems not to work the way as expected above.
Image.pngNX: Scalable Group constraint in sketcher
GUID-251C84EB-2B41-42F0-AA80-C43FFF327158.pngAlias: Curve Stretch