Constrains a spline to be contiguous and maintain G2 continuity with another spline, line, arc, or polyline.

Button
Ribbon: Parametric tab
Geometric
panel
SmoothNot available on the ribbon
in the current workspace
Menu: Parametric
Geometric
Constraints
SmoothNot available in menus
in the current workspace
Toolbar: Geometric
Constraint
This command is equivalent to the Smooth option in GEOMCONSTRAINT.
Following are the valid constraint objects and points: