Support Simulation - Additive Manufacturing Scenario App

Hello collegues,

I have some .stl files exported that represent a part and its two different support structures to be printed. I was able using the digitized shape preparation and digitized shape to surface to transform the part into a .CATPART and use it to simulate a FEM model for additive manufacturing LPBF process. However for the support structures the "automatic surface" ressource does not work and when I generate support structures using the Powder Bed Fabrication App, I cannot create FEM models with these structures and I cannot define the ties between them and the build tray. The examples I've found, people modeled the support structures as CATPARTS already included in the main part. What would you suggest me?