RHEL Repo

I have a RHEL 6.9 Machine. I am able to easily pull a mirror of RHEL 6 repos, but I need to also pull a repo of 7 (I have offline machines that are running 7, it just so happens that I cannot connect these machines up and have to use my 6.9 machine). How do I also create a repo for 7.2, using a 6.9 machine?

Additionally, is there a good list and set of instructions to get all the different repos I may need; basic, optional, etc?

Thank you!