Originally Posted by Wetdogeared
I was aware that I could put a book in more than one collection in eBook Library.
The only confusing part was that there was no mention of Calibre up to this point. I assumed you were referring to Calibre tags; a newer member, from which this question was posed, might not have made that connection.
you are right, sorry i was not clear ; since i only use calibre, i sometimes forget that not everyone does, and that there is actually a sony app that can be used.