Hi,when use sublayer or merge node to merge to usd file together.the two usd can be composited,and the second usd's attributes will override the first one.
is there a way to chose any attributes or any objects to override but not everything?
I whish my explanation is clear.for example there are a.usd and b.usd,both have /geo1 and /geo2 objects,they have different transform and materials from a.usd and b.usd.
when I merge b.usd over a.usd,is it possiable to keep /geo1's transform from a.usd, and use /geo2's material from b.usd?

No that's not possible. The composition engine has a set of generalized rules, which doesn't involve inspecting the names of particular attributes (which would probably be quite complicated and therefore likely quite time consuming).

I think in this case you can block properties on Edit Properties LOP. You just need to do that before you bring a sublayer. Check the minimal example in the attachement.

Edit: well, it's not quite working, it just resets property to default value on resolution. Interesting, intuitively I thought it just skip it

ok,thankyou

@elovikov even an opinion to "block" an attribute is an opinion that gets composed with the normal strength ordering rules. To accomplish what is being asked here, you'd actually have to make sure that a.usd and b.usd only contain opinions about those attributes for which they are each responsible.

Thanks! I see now. I also noticed that I can remove properties in editable layer on Python LOP via UsdPrim.RemoveProperty. Just wondering if it's achievable on any "destructive" nodes like Stage Manager without python?