If you want to add an article of a book there a two ways, that both are not optimal: either you make a whole new entry and re-type the book-title, editors etc. Or you copy the entry of the book, change the item-type and add the author, title and page-numbers of the article.

Instead of this, it would be much easier and faster to have a function like Citavi, where a book, that is not a monograph, but a collection has a button "Add article" so that the new entry has the appropriate item-type and also the general entries (title, editos, publisher etc.) and you only have to add the author, title and page-numbers of the article.

And then you could easily jump from an article to the collection or other articles in that collection. And in the book you see a list of all added articles and can directly jump to them. Or maybe the articles in a book can be in the dropdown-menu below the book-entry.