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Before anything you have to go on the low level account and start the game up and make sure you do all the settings setup like brightness, etc... then close application.
Start the game up on the high level account
Go to public match then create a class for about 5 seconds, press circle until your back on the first screen telling you to press x to start (but don't yet)
Go to switch user (and hover over your low account) press it and just as it gets back on to black ops press x again and you'll get some sort of loading message once that's finished you can press play online if it didn't already connect, then your done
You can dupe campaign, MP and zombies all at once.
Just go to multilayer find a game get a kill and leave and do this for Campaign and Zombies as well!
The following 2 users groaned at Angioy for this awful post:
there are better older more clearer tutorials of exactly the same glitch stop reposting other shit and altering the tutorial by adding or changing 1 aspect
its getting old and we can see through your shit now