Have you looked at this thread -
https://www.mobileread.com/forums/sho...d.php?t=118559 ? There is detailed instructions on using calibre with an ipad. It's how I use my ipad and calibre together, although I've added quite a few of the other plugins as well. during the first post you'll find spoilers, read the one on metadata mapping and plugboard transformations, I think it will help with what you want to do.