Is it possible to model multiple profiles in a mullion? Should I nest one profile inside the other?

IE I have a wood louver system which was created as a curtain wall and I want to embed a steel plate for the structure and I want this to repeat in every mullion/louver. I tried making an assembly but it didn't work.
IE I have a wood louver system which was created as a curtain wall and I want to embed a steel plate for the structure and I want this to repeat in every mullion/louver. I tried making an assembly but it didn't work.
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