iBooks series metadata

Hi

I am looking for a way to play around with the metadata so that I can create my own collection/series for purchases on iTunes. I know we can organise files by creating folders and playlists or assigning prefixes; however, I think the series/collection approach is superior and organise files better.

I came across a web page showing how we can assign series metadata to files. But the approach there is too complicated that I fear disastrous effects will be resulted in for even slight mistakes. The web page is here http://apple.stackexchange.com/questions/151741/ibooks-series-metadata