That's what I do (and a lot of other people that I know) we just move the files around within the library folders to where we keep them. Umm...You really don't need to create any new folders (as P4 has to have everything within the folder it designates for whatever type of file)

My Store              My Gallery

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Remember...getting lost is the senic route to the eventual destination. (And a lot prettier than the straight road)