how do I import audio books on a cd into my new imac
Are these Audiobooks on CDs? Open the Books app, go to the File ➙ Import menu. Then select Disk 1 of the audiobook and import, then Disk 2, etc.
I use the 3rd party app Audiobook Builder which lets me add my own title, cover image (from Goodreads.com) and then create and import into the Books app.