First, I apologize if this question has already been made but I didn't find it.

Is there a way to enlist the forces/momentum exchanged at the interface between two bodies in a weldment structure in a simulation? For example, I run this:

I put a roller/slider fixture on the buottom of the external C beams frame and applying a 1000 N force on the angular beam. How can enlist the global force on the welded side among all the bodies? Can I isolate every body and get the external actions?

Thank you all in advance.