For their creation click on the New button, in PID List, and select SHELL_PART>NON-GEOM_PART.The Part Type for 5 of those can be “Assigned” (name them as fluid_node_catalyst, fluid_node_combustion fluid_node_exhaust_fluid, fluid_node_manifold and fluid_node_underbody) and one should be of Calculated Type (name it as fluid_node_engine_area).