Asset category setup

I created an asset category to the wrong cost and depreciation account for a tax book.   I assigned assets to this category and book.  Now I want to change the accounts on the category setup but I can't.  If I create a new category, do I have to move all asset books to this new category if the asset exists in all books?  If I create a new category and only setup the tax book for this category, then I will have assets that have different asset categories in different books.