Ooop.. i'll leave this here but, I missunderstood your reply. Sorry, maybe it helps another person
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I'll shorthand an explanation sort of assuming some of what you seek
- Open a 2nd iCloud account
- in iPhone preferences, link to it
- but be careful to activate only the "Addressbook" option
- stop the Addressbook APP
- reopen the AddressBook and on the main screen you should have "Groups" button on the top
- tap "Groups"
- here you can activate, or deactivate what you see
Note: do a few tests, and particularly be careful when you create a new entry that you pick the correct addressbook account
hope this helps