You can select and reuse all reference curves in a model. Previously, you could only use absorbed reference curves in the feature for which they were created.
Projected curves, composite curves, curves through XYZ points, curves through reference points, helixes, and spirals cannot be absorbed by a feature. They appear in the FeatureManager design tree where they can be referenced by any feature.
When you open a file created with a previous version of the software that contains absorbed curve features, the position of those features are changed in the FeatureManager design tree so that they can be referenced by other features in the FeatureManager design tree.