Book published in various parts

[Maria (a)]

My question is about "Ghosted" by Rosie Walsh, or more specifically, one Dutch edition. The publisher Boekerij, aside from publishing the book as a whole, has also published it in 10 separate e-books, with the number on the cover. Every one of these separate e-books seems to have been added to Goodreads, albeit in different books.
My question was how to combine these? Should this be handled as a separate series? Can all 10 just be added to the main version?

[Scott]

If they are separate books they are separate books; they don't get combined with anything unless they are identical.

The numbers should be added to the titles of the parts, to avoid confusion.

[Arenda]

Titles corrected.
Books published in part can be added as a series. Series created here: https://www.goodreads.com/series/2590...

[Maria (a)]

Awesome, thank you!