How do I break the Cell Wall ? Easy way ? (Hell In A Cell)

You need a finisher. Once both wrestler's are outside just whip the other person into the cell and it should daze them. Sometimes you'll need to do a running attack and sometimes you won't.
Make sure it's the right side of the cell.(near the announce table)
Make sure they're either as far down, or as far up on the cell as they can be.
You should see an option "OMG!". Use your finisher and there you go.

Store a finisher, go outside and irish whip him to the corner of the cell outside (the one near the announce table), the OMG icon should show up. If it does, press Y or triangle, and you'll break the walls down!