Go to your Window>Links and this will bring up the links panel.
Select all the images in your document and use the Flyout Menu at the top – and there’s a Copy Links to command.
You can then copy all your images to your page wise folder.
Finally – relink all your images to that folder using the “Relink” command in the Links Panel flyout menu.
Copy and paste this URL to your browser for a visual example
https://s15.postimg.org/jxfl7x197/Untitled_1.png
(sorry I don’t know how to add images to the forum?)