how to setup one local repository server for all OS version

I have approx 100 rhel6 and 200 rhel7 servers and 100 and 100 rhel8 servers. all those servers does not internet. I need to patching from one server, which have Internet.
I have prepared one rhel8 jump server , I am looking to download all packages in one server for all version(rhel6, 7, 8 from RHEL repository) and then make local repository for all Intranet servers.

please help me, if it is possible without thirdparty software.