Spline - Draw

Spline creates curves called Non-Uniform Rational B-Spline NURBS
Splines are defined either Fit Points or Control Vertices

Home tab > Draw panel expand > Fit Point

Pick few points at the different location

Fit point coincide with the spline

Home tab > Draw panel expand > Control Vertices

Pick few points at the different location

Control vertices define a control frame
Control frame provide a convenient method to shape the spline