(adsbygoogle = window.adsbygoogle || []).push({}); Firstly, invite your friend to Player Match and when he arrives go to Private Match and set as S& (don't edit settings)
now hover over Combat Training and press X, O, Up-Dpad, X
Now go to private match and change to S&, get the pop up where it says Lives: 1 Life; 2 Lives; Unlimeted.

Now select unlimeted and leave on the pop up.
Message your friend and tell him to make sure its on Combat Training.

Now get him to invite you. While your on the pop up, accept the invite and then tell your friend to back out. You will get a message.
'Game Lobby Closed'. Now press X on the message and make sure the settings are on Unlimeted and press O. Now... CONGRATZZZ!!!!

Just change the map and Enemies / Friends and invite if you want and have fun Combat Boosting

Honestly, I Couldn't find any post that specifically aimed at S& Unlimeted Lives, however i found the Player Match (Public Match) Version which is patched i beleive. I would have used the search option but when i search, unrelated glitches are found. :420:

isnt this patched??