Forking existing session

I wonder if there is any prior art or thinking around forking existing session?
I.e. creating a copy of the existing session retaining the history but being independent from the original one going forward.

My use case is as follows: I typically spend some time directing codex to read certain files, search a bunch of latest api etc priming session to then start executing on multiple tasks. Considering I would much rather prefer building these tasks in parallel I found it useful to fork existing session.

Curious if this seem useful for broader audience or if there are existing plans around this?
Happy to share more information to clarify the use case.

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Can't upload the video on github currently, please see here https://x.com/zats/status/2005796966920511791