Split Curve Options

The following options are available:

Automatically create constraints Select this sketch option to automatically generate constraints based on shapes created or on snaps. This option is enabled by default.
Snap to grid Select this sketch option to turn snapping on or off while sketching. The cursor will snap to the minor grid spacing increment while you sketch. The defaults are 1mm for Metric and 0.125in for Imperial units.
Snap to angle Select this sketch option to turn angle snapping on or off while sketching. The cursor will snap to the angular snap increment while you sketch. The default is 15 degrees.