To add a through mortise to a rectangular face:
- Press the “Mortise and Tenon” button in the “Modify” panel.
- Select a board to cut the mortise. Select a face for the tenon
- Check the “Depth Offset” checkbox and set the “Depth Offset” to the thickness of the board or larger.
- Specify number of tenons, depth, length, thickness and offsets.
- Press the “OK” button.