Creo Interactive Surface Design (Style) > Curves > Editing Multiple Curves > To Convert Multiple Curves
  
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.
2. To select curves to edit, hold down the CTRL key while you click curves.
3. Click Style > Curve Edit. The Curve Edit tab opens.
4. Change the curve type by clicking one of these commands:
◦ —Converts free curves to planar curves.
◦ —Converts planar curves or COS curves to free curves.
5. Click .