I do as mentioned by one person. I put the series number of the first book.
So if I have Book A (Books 1-3), Book B (books 4-6), Book C (Books 7-9), Book D (Book 10, Book E (Book 11).
Book A is Series 1, Book B is Series 4, Book C is Series 7, Bookd D is Series 10, Book E is series 11.
But I have a Sony, so no matter, they sort in series order. Whether I number 1.23, 4.56, 7.89, 10, 11 or 1, 4, 7, 10, 11.
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