Roll up Sub-Assembly Attachments into the top level Attachments?

Here, we’re generally using 10-20 sub assemblies in a top level BOM. Some of those subs have subs. What I’m finding is attaching documents or guides to lower level sub-assemblies are hard for the production team to dig and find. I’d appreciate the ability for all attachments in lower level subs, to roll into the top level. Is that a thing, or must I search out the attachments and reattach them manually to the top level?

Thanks in advance,
-Mike