How to add, Two books in one

[dissiminator]

I got this 1946 swedish translated edition of The Call of the Wild. The title is Skriet Från Vildmarken. Np.
Thing is, the edition also includes Before Adam.
How do I add this?

[Ayshe]

Just like you would add a new book, I think, link you could use: https://www.goodreads.com/book/new?au...

It will be separate work as I didn't find already existing record for book having this content it can be combined with.

This: https://www.goodreads.com/book/show/2... for example, contains both the "The Sea Wolf" and "Michael, brother of Jerry".