First off, thank you Reech!
I found the option, Kathy, thank you.
The ISBN thing is an issue. Most of my books are from Amazon's "Free Classics" section and so they do not have ISBNs, just Amazon's internal ASIN numbers. I tried importing anyway, but only 29 out 275 went over. (I may have used the paperback ISBN on so of those in order to get some info - not sure).
Oh, well, who said Amazon ever made anything easy.
Thanks again, guys.