Other Modules > Modifying Geometry > Modifying Splines > To Modify a Spline Using Control Poly
  
To Modify a Spline Using Control Poly
1. Click Control Poly. The spline’s control polygon appears, displayed in white.
2. To adjust the shape of the spline, pick a point on the control polygon and drag it to a new location. You cannot pick endpoints. The spline rubberbands to its new shape as you move the point.
3. Place the control point by clicking in the required location for the point.