Cubit 15.8 User Documentation
The full command for the creation of composite curves is:
Composite Create Curve <id_range> [Keep Vertex <id_list>] [Angle <degrees>]
The additional arguments provide two methods to prevent vertices from being removed from the model or composited over. The first method, keep vertex explicitly specifies vertices which are not to be removed. This option can also be used to control which vertex is kept when compositing a set of curves results in a closed curve.
The angle option specifies vertices to keep by the angle between the tangents of the curves at that vertex. A value less than zero will result in no composite curves being created. A value of 180 or greater will result in all possible composites being created. The default behavior is an empty list of vertices to keep, and an angle of 180 degrees.