Sub-assemblies.
It would be advantageous if we could have sub-assemblies, so that a series of sub-assemblies can be fabricated/constructed prior to assembling on a main/primary assembly.
A primary assembly would need to be assigned and then its attaching sub-assemblies would be associated with the primary assembly in the model.
This functionality could also be used for complex welded assemblies which can be broken down into sub-assemblies for clarity.
“Assemblies and additional elements” process, by selecting the items at the detailing stage has the potential to introduce human error if not all components are selected. We require this Sub-assembly feature to be applied in the model so it can be assigned and check within the modelling process. In a lot of cases the detailer is not the same person who modelled the project, which means they would need prior knowledge of how to assemble these assemblies together.