after you finish the step 12 or 14, you can extract the curves from solid body.just follow the step as below:9 \* B: t6 f9 P
1: make new layer for new curve.4 Q+ J! r5 Z# `* K" Z8 u A `
2: 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.4 c/ ~3 n4 C: O& T& B5 U
3. make the solid layer invisible but the new layer of new curve selectable or work.% |3 V7 B9 U* g8 f+ y" u9 h
4. that's all.