@cmcannady, thanks for the links and tips. Yes, I’ve activated custom repos as described. As far as I understood, one difference compared to RHEL external site is that YUM is being used instead of BES Relay structure.
Unfortunately I have no idea how to work with the custom repositories, eg. having a custom site based on a repo, create webreports or SCA Patch reports against a repo etc?
Or is my expectation completly wrong?