Originally Posted by ixtab
[...]And last but not least: calibre doesn't support nesting anyway, so I think that calibre interprets that string as the book being part of 3 collections.[...]
Yep, I was aware of that. The theoretical item would be part of 3 collections then and I wanted to know if there was a way where I could fill the "Kindle Collection" column differently and the import method would automatically recognize that it was a nested collection then.
Oh well, still thank you.