More post processing in one scene.

Hello guys…2019.3 HDRP: I have in a scene two distinct groups of assets with two relative groups of volume post-processing/render. How do I get one of them (post-processing), not above the other… or better: assets 1=pp 1 and assets 2=pp2? Thanks to all

You can use the “local” mode in you volume system. (Juste set mode to local instead of global).
You will need a collider to delimit the volume affected by your post process stack but that will enables you to affect different assets with specifi volume stack.
You can even do blending between the the volumes