The Dimensions tab of the Turning Feature Properties dialog is different for each turning feature type. Most of the attributes on the Dimensions tab are the same as on the New Feature - Dimensions page of the New Feature wizard, however there are some additional advanced attributes.
Stock Curve button — You can limit the extent of the roughing by using a stock curve. Click the Stock Curve button and select or pick a curve in the Select Stock Curve dialog. This is useful if you are working from a casting, for example.