Rob Jost, of SolidWorks Product Definition team, goes into deep detail about the new Style Spline sketch tool now available in SolidWorks 2014, in a recent article posted on the SolidWorks website.
The new Style Spline actually isn’t something new in the world of CAD. It’s an entity that’s been around for a long time, but is sometimes overlooked. It’s called a Bézier curve.
His very detailed article with a tutorial is found here: Style Spline: What is it and why is it useful?