Guardrail plate force simulation

Hello
I would like to make a simulation to calculate the resistance of an aluminum railing plate. It is an assembly, the plate is fixed by stud on concrete slab and the thrust is done on the top of the post at 1m height. The goal is to compare 2 turntables (existing and a creation). My software does not allow the calculation of assemblies. Could someone do this to me? I have all the step files.
Thank you