Do I really have to re-enter EVERYTHING about the book to do an update

I have had a book selling on iTunes since April. I recently made some revisions and want to upload them. The new iAuthor take me through some template process, then loads the producer program interface. At this point it wants me to fill in everything all over again about the book. The upload button is greyed out even though I am logged in. Is this the whipping I have to go through? Sorry guys but Amazon and NOOK are easy to update. Please tell me there is some easier method I missed....