To Convert Multiple Curves
1. In the Model Tree, right-click the Style feature that contains the curves to edit, and choose 
Edit Definition. The Style tab opens.
Edit Definition. The Style tab opens.2. To select curves to edit, hold down the CTRL key while you click curves.
3. Click > 
Curve Edit. The Curve Edit tab opens.
Curve Edit. The Curve Edit tab opens.4. Change the curve type by clicking one of these commands:
◦ 
Planar Curve—Converts free curves to planar curves.
Planar Curve—Converts free curves to planar curves.◦ 
Free Curve—Converts planar curves or COS curves to free curves.
Free Curve—Converts planar curves or COS curves to free curves.5. Click 
OK.
OK.