Cutting a pcurve into two

This cuts the selected pcurve into two at the selected point.

1. Select a pcurve.
2. Select a point on the pcurve.
3. Click on the Trim Region toolbar.

   The names of the pcurves are defined as follows:

   If the name of the selected pcurve was 3, then one pcurve is 3 and the other 3A.