I have a structure for both session and catalogs.
I start uploading from camera to a session - so all my files are organized in a structure of sessions. In the session I do culling, picking and basic editing.
I then want to have an overview of my sessions - so I can browse in between alle sessions.
After basic editing in the session I export it to a catalog to make it possible to do the browsing .
If I then within the catalog do further edits I really need the possibilty to
Reexport my catalog images back to the session so the two are in sync
Yes this sounds similar and I already upvoted it. I intend to "migrate" my old request into the new forum topic somewhat later.
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This sounds somewhat similar to your old request (linked to above).
Being able to sync separate catalogues would be very useful too. Have a look at this (archived) feature request: https://support.captureone.com/hc/en-us/community/posts/8457407824541-Synchronize-adjustments-between-catalog-and-sidecar-subfolders