after you finish the step 12 or 14, you can extract the curves from solid body.just follow the step as below:; K* ]# }/ }7 B, _0 j
1: make new layer for new curve. + p& m& e1 g& S7 O2: under modeling, choose Insert--Curve from Bodies---Extract---Edge Curves---All in Face, then select the face of solid bo dy,---ok---0k---Cancel, leave the Extract curve dialoge.) l; P: m7 I( {- Z! ^
3. make the solid layer invisible but the new layer of new curve selectable or work.+ x9 T3 u6 m" d& R, }5 D( W
4. that's all.