Though it is used to project sketches, why it is called Split Line.
Maha,,,, The "Split Line" is used to split faces. If you wanted to split the part your can use "Split". You saw how the split line tool can be used the other day.
Notice when you use the "Split" function you end up with two bodies.
Edit:.. I suppose to answer your question: the split line function does not actually produce a line or curve but as you know you can, with a 3d sketch, convert the edge of the split line to a spline the same shape as the edge. This is not a spline on surface but a spline on the edge of the split line face. A bit confusing I suppose. Also, as you know, you can Project the curve.
Thank you very much for your explanation.
I can come to a conclusion that Split Line is doing two things:
Whereas Project Curve tool is Project the sketch only on the surface.
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