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 the number of tenons, depth, length, thickness and offsets.
- Press the OK button.
