• When you modify a feature, you must regenerate all the features after that feature, even those that have been removed by a work region cut. To avoid regenerating features that are not visible in the specified work region, use both the Features and the Work Region commands when you create the simplified representation.

• When you create features in a simplified representation with a work region, you cannot select edges and surfaces created by the work region cut.

• You cannot use both Work Region and Surfaces in the same simplified representation.