To move pages from one PDF to another, open both PDFs in Preview, go to the View menu and enable “Thumbnails”, then drag the page thumbnails from the Sidebar of one PDF to the Sidebar of the other.
To move pages from one PDF to another, open both PDFs in Preview, go to the View menu and enable “Thumbnails”, then drag the page thumbnails from the Sidebar of one PDF to the Sidebar of the other.