I am trying to create a fixture for a press tool. I have been able to create a cavity of the part but the assembly is hollow and has many features. This leaves floating features and material, from the hollow parts of the assembly, in the cavity. I am pretty green when it comes to Solidworks and haven't been able to find any posts/videos of something that helps me out. Is there a way to make a cavity/impression of an assembly, treating the assembly as a solid body all throughout?