To Create a Spline in a Drawing
1. Click > 
Spline. The Snapping References dialog box opens. Use the arrow icon in the dialog box to add any references you want to set up before you sketch.
Spline. The Snapping References dialog box opens. Use the arrow icon in the dialog box to add any references you want to set up before you sketch.2. Click to define a start point and then any number of interpolation points to define the spline.
3. To end the spline at the last selected point, press the middle mouse button.