Having a private branch of a public repo on GitHub?

Question

I have a public PHP project in a GitHub repo, which contains just one branch (master).

I want to have a separate branch/fork that is private for me (I have paid for

Answer 1

1. Duplicate your repo.
2. Make the duplicated repo a private one on GitHub.
3. Clone the private repo to your machine
4. Add a remote to your public repo (git remote add public git@github.com:...)
5. Push branches with commits intended for your public repo to that new public remote. (make sure you don't accidentally commit private-only code)
6. You can bring in changes to your public repo using 'git fetch public' and then merge them locally and push to your private repo (origin remote).