- On the ribbon, click (Reference Plane).
- To draw a line:
- On the Draw panel, click (Line).
- In the drawing area, draw the reference planes by dragging the cursor.
- Click Modify to end the line.
- To pick an existing line:
- On the Draw panel, click (Pick Lines).
- On the Options bar, specify an offset, if desired.
- Select the Lock option to lock the reference plane to the line.
- Move the cursor near the line to which you want to place the reference plane and click.