Split

If you want to delete the separated part from the original object, you can choose Delete directly after Split since the selection is still active (this works only if you are in polygon mode).

The Split function differs very slightly from the Disconnect function; the difference is that, when using Split, the disconnected surfaces leave a separate object behind. The original object is not changed. This tool can also be applied to splines. A separate spline is created from the separated segment (as with polygon objects). When splitting splines, a point selection and point mode are required.