You can have multiple accounts w/ OpenAI, attached to different emails - just log out of one and log into the other.
And fine to do it in same folder same local laptop?
Yep, no problem at all. The only drawback is sessions cannot be shared directly between accounts, so if you're in the middle of something you'll have to do some extra work. To that end I have a handoff skill to persist state to a local markdown and a resume skill to load that state into a new session.