Hi Rudl, so that part of the instructions are about how to edit the UI to add in a button for the CLine command.

You can just ignore those part of the instructions and instead set up a shortcut key to launch it instead - put in: ConstructionLine for the command part of the shortcut key when you add in a new one.

To add in a new shortcut key, go to Options > Shortcut keys.

That's kind of easier than editing the UI.

- Michael