From FreeCAD Documentation
- There are several ways to invoke the command:
- Press the Split button.
- Select the Modification → Split option from the menu.
- Use the keyboard shortcut: S then P.
- Move the pointer over the correct edge of a Draft Line or Draft Wire.
- The edge is highlighted.
- Do one of the following:
- If the wire is closed:
- Pick any point on the edge.
- The edge is detached from the wire and becomes a separate wire.
- If the wire is open:
- Pick the correct point on the edge. See Notes.
- The wire is split at the picked point.