Hello Rex,
Thank you for your question.
I am not sure if I understood your question but it seems you want to grant access user(s) or group(s) to a particular branch. If so, I would suggest you on referring to Using branch permissions documentation for further information.
Regarding on the SSH Keys, you can grant read/write access to a particular repository and/or project. Once you do that, you can review the documentation above to restrict access to branch(s) to user(s) or group(s).
If you find this answer useful, I would kindly ask you to accept it so the same will be visible to others who might be facing the same issue you have inquired.
Thank you for your understanding.
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Kind regards,
Rafael P. Sperafico
Atlassian Support
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