Detailed Drawings > Working with Drawing Sketches > Modifying Draft Entities > Modifying a Spline > About Modifying Splines
  
About Modifying Splines
You can modify splines in the following ways:
Move a single point or a range of points on the spline
Add points to the interior of the spline, or extend the spline by adding points to the exterior
Delete points from the spline
Use a deviation value to reduce the number of spline points
Smooth the spline
Use the spline control polygon to modify the spline