You will have to insert products as product-book if you want the additional book related fields to show up. As far as I know, there is no easy way of mass migrating existing general products to the book type other than what I mentioned in the earlier post i.e. via the database.
You cannot easily change the product type via the Admin interface.
IF you can upload products via easy populate then this may be simpler, but I don't know if it is possible using easy populate.
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