Board Thread:Questions and Answers/@comment-25549762-20160324005059/@comment-25120690-20160324190848

Yes, but if you want to enchant an enchanted tool or such, you must first enchant a book. Then, you can take the book and "item" you wish to add more enchantments to, and put them in an Anvil and add the enchantment from the book to the "item". It will then have the book's enchantment and the original ones it had before.