This section discusses the different ways of
integrating surface modeling into solid modeling.
Using Surfacebased Features to Integrate Surface Modeling into Solid ModelingUsing surfacebased features (Split , Thick Surface , Close Surface , Sew Surface ) is not a new way of integrating surfaces into solid modeling. However, what hybrid design changes is the fact that surfaces can now be included in the same body as the features they support. Here is an example of what you can now obtain: 

In such a case, surfaces are necessarily
defined prior to defining the feature. Indeed, this is because that the
order principle inherent to hybrid design must be respected. If you modify
these surfaces, the solid features located after the modifications will be
affected by those modifications.
Using Boolean Operations to Integrate Volume Design Into Solid DesignYou can use Boolean operations (Assemble , Intersect , Add , Remove ) to integrate volumes into bodies. Boolean features are the only features that can reference volumes. 

This task shows you how to integrate a volume via an Intersection operation.  
Open the HybridDesign.CATPart document.  


Using Insert Added Volume to Integrate Volume Design into Solid Design 

