Extend an Existing NURBS Surface or Curve

The Extend NURBS menu command allows you to extend any NURBS curve or surface along a straight line or smoothed curve. To do this, select a NURBS curve or NURBS surface. Select Model > Extend NURBS

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Select the end point (NURBS curve) or edge (NURBS surface) to extend by using the Next or Previous buttons. Select whether to make a linear or smooth extension. Enter the distance of the extension. Click Preview to see the result. Click OK to extend the NURBS curve or surface.

Before/After: