You can configure all the command options in the AVC Options Palette on the Curve Subtract tab.

Configure the coordinate system (UCS) - the program will project all curves onto the XY plane.

Self-intersecting curves are not suitable for region construction and will not be processed. It is recommended to pre-process the curves with the Simplify Polylines (CPoly) or Outside Loop (OSL) commands.

You can select the source curves before calling the command.

Call the CSub command. If nothing is selected in advance, the program will ask you to select curves. You can work with any finite curves: lines, polylines, 2D polylines, 3D polylines, splines, circles, arcs, and ellipses. Infinite rays (xLines) and multi-lines are not processed.

The curve selection prompt has options for quickly switching the style and for opening the settings dialog.

If the selection of subtrahend by layer is configured, the program will immediately separate the source and subtracted objects from those already selected. If there is no layer of subtrahend curves, the program will open a dialog for selecting a layer from all available ones.

If the subtrahend curves are not selected by layer, the program will make another curve selection request for you to specify the subtrahend curves.

All curves will be projected onto the XY plane. If a gap is specified, closed subtrahend curves will be offset outward, and a zone of two gaps wide will be built around the unclosed ones.

After subtraction or cutting, all closed contours will remain closed. The result will be a closed polyline or spline. However, you can set the result of subtraction for a closed source curve to be a Region.

Curves that have not participated in any subtraction will remain in the drawing unchanged (even if the source ones are set to be deleted).

The process of subtracting hundreds and thousands of curves can take a long time. You will see a progress bar and can interrupt the command by pressing ESC.

Watch the command line. The program will display messages about the current settings, all failures, and the results of the work.

The installer that ran when you downloaded this app/plug-in from the Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 10/11) and uninstall as you would any other application from your system.