Comment by JT on question “technical way of managing files – grouping files in xcode” in StackOverflow.com.
Adrian Kosmaczewski explains an approach known to experienced Xcode developers. It’s the method I use and it “makes a place for everything and puts everything in its’ place”. Hope you find the article, linked below, what you’re looking for. Moreover, his blog is one of the best around.
http://kosmaczewski.net/2009/07/28/code-organization-in-xcode-projects/