To create the example shown, assemble Part A and then merge it with Part B. The features of Part B regenerate first, and then intersect with the features of Part A to form the merged part.

Whenever a solid portion of one part intersects with a void portion of another part (for example, a hole or cut), these areas are automatically filled. However, if you now create a Through All hole in the new Part A, it penetrates all features, regardless of origin. You can merge merged parts with other parts, creating multiple subpart relationships.