How to use ggBS and ggMD

I am studying using the tutorial files on the page.
Quick Start Guide - Parametric Structural Analysis (SAP2000)
However, I am having trouble understanding the content beyond page 33.
Specifically, I am confused about the ggSAPBakeModel component and the ggSAPModelDecompose component, as they seem to be new concepts to me. I am unsure about how to properly connect these components in my workflow. Could you please provide guidance on how to effectively utilize them?

Below is the file I have created for reference.
20240513_rhino_to_sap.gh (29.1 KB)