Add book to series?

[E.J.]

Hello!

I need to add this book to my Ziva Payvan series (https://www.goodreads.com/series/1360...) but it's an omnibus edition of the entire series, so it's not really Book #4, but not Book #0.

Would it be possible to just add it to the series without a book number (which is what it currently looks like on the page)? Or else could it be like The Ziva Payvan Collection (Ziva Payvan, #1-3)?

Thanks!

[Arenda]

Added to the series as book 1-3.