Calibre does not allow you to store multiple book files of the same type (file extension) against a given book record. Therefore unless you want all the different books stored inside an archive format (e.g. .7zip, .rar) then you are going to end up with multiple book entries in the Calibre GUI.
What I personally do is one or more of the following (whichever seems most appropriate to the material):
- Set the book title so that the common part is at the front so they at least sort together when sorting by name
- Set the Series field so that the name reflects the grouping (e.g. Encylopedia Britanica). You can give all entries the same series number if you are not concerned about order, or set it to enforce a desired order.
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