Adding Tangency Control to Splines To add tangency control: In the Edit Sketch mode, select a spline. Click Add Tangency Control (Spline Tools toolbar) or Tools > Spline Tools > Add Tangency Control to display a new handle. Drag to place the handle. Click to position the handle.Video: Adding Tangency Control Use the handles to control tangency. Click . Parent topicB-splines Editing Splines