Buffett has held these stocks for more than two decades.Any investor would love to follow in Warren Buffett's footsteps, choosing stocks that over time will create a billion-dollar portfolio. The storied investor manages more than $257 billion in securities at the helm of Berkshire Hathaway and has generated market-beating returns over almost 60 years.While our portfolios may not hit the$1 billion mark, I have good news for you: Following some of Buffett's moves could help lift the value of your portfolio ...