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@Strongbow - it would be *highly* unlikely in my opinion that calibre will change the definition of a series column, as too many things would break. The series column in calibre is really a "sequence" column (which suits the 99% of books scenario), not a "group" which is more what you are after.
You've got a number of options - as theDucks says you can either use a fake number, or you can just create a text custom column to use as a secondary series column.
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