Sigrity SystemSI W-element experimentation

Is there a way to save the parameters in the Tline Editor used to generate a W-element?  For example, assume you are trying to determine the best stack-up for a substrate design and you want to experiment with different dielectric materials.  You create a simulation Workspace and generate a W-element with specific spacing and traces.  The simulation completes and now you want to try the different material for comparison.  Using "Save As" to create a new Workspace works well until you try to edit the parameters for the for the W-element using the Tline Editor because all of the original parameters are gone.  The only thing that exists is the actual spice sub-circuit, which does not contain any information about how it was generated.

Any ideas on how to resolve this other than brute force of reentering all of your parameters for each new simulation?  Note the brute force method works but requires significant time to recreate the MCP/connection information.