To Convert Curves
Use this procedure to convert planar curves, radial path planar curves, COSs defined by points, and dropped COSs to the curve types listed in the table. To convert a COS by intersect, see To Convert a COS by Intersect.
Curve Type
Can Covert to Curve Type
Planar curve, radial-path planar curve, COS defined by points
Free curve
Dropped COS
Dropped on a surface, intent surface, quilt—COS defined by points
Dropped on a datum plane—Planar curve
COS by intersect
COS defined by points
1. In the Model Tree, right-click the Style feature that contains the curve to convert, and choose Edit Definition. The Style tab opens.
2. Select one or more curves to convert.
* 
Free curves cannot be converted.
3. Click Style > Curve > Convert. You are asked for confirmation.
4. To complete the conversion, click Yes. To cancel the conversion, click No.