You can split curve into multiple sub curves by project points onto the curve.
To break a curve:
Click Break Curve (Curve toolbar) or click Geometry, Curve, Break Curve .
In the dialog, select the curve break type:
a. Raw curve b. Searched point lists. "Max. Ang" sets as 60.0. c. Searched point lists. "Max. Ang" sets as 60.0 and check "Use Step Len".
a. Closed curve a. Select five reference points to split curve c. The final 6 curves split from raw curve.
a. Face has only one edge b. Batch break face, "Max. Ang" set as 60.0
a. Raw curve b. Tangent Span breaking result