CAE - Create multiply bar

Hello! I have a solution for creating a single bar, but I want to find a solution to create a multi-bar. I need to find the nodes using the facet body. Facet body is a rivet or a bolt. I have a nodes on the middle surface and these nodes are interconnected by bars. Within the body there are two nodes (one node per surface). Many bodies and they are randomly located. How to find nodes inside faceted bodies?
Thanks!