The Split Draw command can be used to split many draw object (Straight Lines, Curved Lines, Circles, Polygons, PolyLines).

Until a split point is selected, the split point under the cursor will have a blue marker.

If the object being split is a Polyline, the split will either result in a Straight Line and a PolyLine or two PolyLines depending on where the split is along the line. (PolyLines must always have at least 2 segments).

Filled Circles and Polygons will be unfilled after the split.

If the split object is a Circle, the result is an circular arc split at the point with a small (5 degree) gap.

If the split object is a Polygon, a PolyLine with two end points at the split results.