separating a combine

[Lee (of Shalott)]

Someone had already combined this book
http://www.goodreads.com/book/show/22...
which is subtitled: 7 Powerful Tools for Life and Work
with the newer version: 10 Powerful Tools for Life and Work.
I tried to separate these by *various means* to combine them with the right 7 or 10 subtitle, since the books are technically not the same...I'm not able to do it.
I'm not sure what to do - I've left an ebook & kindle edition uncombined for now, waiting to be combined correctly.
Can/should these be uncombined?
Thanks for your advice.

[Vicky]

The problem was that some had Marilee G. Adams listed as the author and others had Marilee Adams. I got them all on the same author, separated them and combined them correctly. :)

[Lee (of Shalott)]

Thank you so much for taking care of that Vicky. Some of the covers had just Marilee Adams, others Marilee G.. I wasn't sure about the policy on that...I assumed it was best to put the author in the field as it appeared on the book. Thanks again!

[Vicky]

You can only combine books that have the same author assigned to them. If there is more than one way an author publishes a book under, we normally go with what WorldCat lists the author as to make sure they're all in one place. :)

The exceptions being pseudonyms, since they're purposely different.