To Split a Curve
You can divide a single curve into two pieces at a selected point. The two resulting curves are joined by a soft point at their ends.
When a curve is split, the two resulting curves have the same curve degree as the original curve.
1. In the Model Tree, right-click the Style feature that contains the curve to split, and choose Edit Definition. The Style tab opens.
2. Click Style > Curve Edit. The Curve Edit tab opens.
3. Under Curve, click the collector, and select a curve.
4. Right-click the point at which you want to split the curve and choose Split from the shortcut menu.
The curve is split at the specified point. The resulting curves change shape as they refit to the new defining points.
5. Click OK.