You edit splines in the same way as you edit garbage masks, working with their vertices and tangents. See Moving Vertices and Tangents.

If Lnk Src & Dst is selected from the Link box, your edits affect both the source and destination spline regardless of where you make the edits. See Linking and Unlinking Splines and Axes.

To edit a spline:

1. From the Edit Mode box, select one of the following modes to edit a spline's vertices.

   Select:	To:
   Select	Select one or more vertices.
   Move	Move vertices to a new position.
   Scale	Scale vertices in relation to the axis centre of the spline.
   Delete	Remove vertices from the spline.
   Break	Break tangents of vertices.