Finally after trying so many times I've got it working.
How I Did It Wrong:
I posted this question here after trying several times and failing and this is how. I initiated the install in steam, it started downloading. A folder was created for BF4 in my steam library like this:
. Then I exit the steam and copied ...
As you probably know, BF4 is an Origin game either way. You merely bought it on Steam. Launching the game on Steam should bring up the Origin application.
Because Steam doesn't know you have it on Origin, Steam will still force you to re-download it. Fortunately, according to multiple users on this Reddit thread, you can use an Origin download to at least ...