You could connect the tablet to calibre. Calibre will then show which books are on the device and in the library. Select these book, eject the tablet, connect the phone and send the selected books to the phone. So long as you are careful not to click anywhere and lose the selection, that will work.
But, I would modify this in a couple of ways:
- After selecting the books, you can "mark" them. This is a calibre function that puts a pin at the start of each line in the list for the books. If you don't already have it, you will need to add this to the toolbar or menu.
- Use the Reading List plugin. With this you can create lists. You can create one and add the books from the tablet to it and then add them to the phone later. You can also create the lists so that they sync to the device a soon as calibre sees them. With that, you can create a list for each device. When you get a new book, you add it to the lists for the device you want the book on and when you plug the device in, the book is sent to it.
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