you have to fudge it by putting in series numbers like 1.05 for an anthology of books 1-5 of a series- ugly but I've not seen any better way suggested.
I have two of L Hamilton's 5 volume sets. for books 6-10 and books 11-15 of her main series,.
So I have them as 106.10 & 111.15 so that they appear outside of the normal sequence
but I could have just used 6.10 and 11.15
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