And by my understanding, the octane object from chlid sets will totally overwrite contect under the octaen object tags from parent sets...

Yes, I hope that the project can be organized simply, but I still need to use light passes or other staffs under ocatane object tags, and also, disabled motion blur in these tags.
Or do you have some suggestions for my groups organization?
Here's my scene:
https://we.tl/t-ZL7yFXfHL3
It might be a ...

my project film seems too large that can't be uploaded to here, or if i can upload to anywhere you are willing to download?

all my settings here

Hi guys!
In this scene, I want the wheels, road, and gears to have motion blur. With the same tag settings, the wheels and road surface have motion blur, but some gears do not.
How can I solve this ?