Help! Problems citing an introduction of a book

I am trying to cite an introduction of a single-authored book (author of the intro is different from author of book). The only category I can find in endnote that gets close to this is “book section.” The problem is that with this category, it assumes that the book is an edited volume, so rather than being able to enter the author of the book (which is needed within the citation, along with the author of the intro), it asks for the editor of the book. 

Has anyone come accross this before?

Thanks in advance