I am trying to write a script which will build a proper assembly out of existing configurations once the menus are all complete. However, all the existing tutorials are based around building a new configuration, or a new assembly. My question is: what are the specific Python script commands for choosing and activating a configuration from existing configurations already present in the assembly? Failing that, can I choose to create a new assembly and populate it with a pre-made assembly? I am trying to build a script which will allow my salesforce to build their own 3D models to export to customers, for some background. Thanks!