Thing is, when I was using a Sony Reader, the Tags and Series columns were it. There was no choice to use a custom column. So by the time I got my Kobo Aura H2O, my library was set using Tags and series and I see no problem using them. The only thing I have to do sometimes is to delete anything put in either/both columns when the eBook(s) is/are imported into Calibre.
But if you decide to just let those columns get populated by the eBooks and use different columns, that will work too.
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