I'm trying to learn structure system tool. I'm very comfortable with weldments.

For some reason some of my weldment libraries don't work with struc. sys. See screen grabs below from structural system (top pic) and weldments (bottom pic), also file structure from PDM vault, showing required 3-deep folder sturcture. Weldment Profiles\DD Proprietary Extrusion\Mill Finish

How should folder structure for structural systems be set up, and where is this documented? If you can't use what you've already set up for weldments, but have to create a parallel system, that would be pretty tedious....