Using the Spline Width Ramp, you can create custom shapes from spline primitives by varying width values at specified points along their length. Values generated by the ramp are multipliers for the set Width attribute value. The Width Ramp is useful for creating feathers, scales, leaves, or other custom shapes from spline primitives.
To shape spline primitives using the Width Ramp
You can also select a point, and then enter a value beside Selected Position.
You can also select a point, and then enter a value beside Selected Value.