"Series" is for books that exist in multiple volumes, whether they have the same name or different names. For example, imagine that the following books existed for some hypothetical product -- we'll call it SuperStuff:
SuperStuff User Guide Vol. 1
SuperStuff User Guide Vol. 2
SuperStuff Power User Guide
SuperStuff API Reference
You could create a series called "SuperStuff Manuals" and then make those books number 1 through 4 in that series. If a book named "SuperStuff Power User Guide Part 2" came out later, you could make that number 3.5, so it would fit in between 3 and 4.
I'm really not sure what you mean by "binding". In English, that usually refers to whether a book is hardcover, paperback, etc., but obviously that doesn't mean anything for eBooks. Could you explain a little more clearly? (or just explain in whatever your primary language is, and I'll run off to Google Translate if I can't read it).
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