CBSPLINE
ManualCBSPLINE creates a closed B-spline from a selected polyline or temporary polygon.
Syntax: create/select vertices or select a polyline, then run CBSPLINE.
Use SELECTV to define the curve leader with vertices, or select an existing polyline. The polygonal leader is limited to 20 vertices.
Related commands: CSPLINE1, CSPLINE2, OBSPLINE, BEZIER, SELECTV.
Undo: Yes.