As an alternative approach, you can use the mesh offset tool in the Edit Mesh toolset to create a skin reinforcement by sharing the nodes of the offset shell with the underlying orphan mesh. However, the equivalent offset shell does not appear in the Model Tree as a skin because using the offset shell to represent a reinforcement skin is just one of many potential uses of the offset shell. If you are creating more than one layer of reinforcement skins, you should specify a distance of zero between the layers so that the layers can share nodes.