Can you reverse engineer an epub and TOC issues

First a quick explanation, I had painstakingly set up my structure detection and my TOC xpath expressions for level and then of course one morning I had the blue screen of death. I luckily had all my library saved on my tablet with Calibre Companion so that was saved. Now I'm trying to convert some .odt files to .epub and I can't remember what I had set so would like to know if there is any way to find any of the aforementioned information in a previously converted .epub? If not what I need is help with my TOC, what I would like is

Series
But what I get is
Series
Book 1
Chapter 1
Chapter 2
Book 2
Chapter 1

Or I get Series which I then have to expand to see Book 1 and Book 2 and I have to expand those to see the individual chapters.

I know this is something simple, a box checked or unchecked wrong or just something wrong in the Chapter lever xpath but at this point my brain is screaming "ERROR" and making me crazy. If anyone has any ideas I would love to try them.