Which product works well to choose select pages from an existing PDF and copy to a new PDF file?

Hi Gregh65396892,

You would need to use Acrobat for this purpose, you can download a free 30 day trial using the following Link : https://www.acrobat.com/en_us/free-trial-download.html

After downloading and installing Acrobat, You can open both the files in acrobat with page thumbnails view enabled, and then select the pages from one pdf file and drag them over to another pdf file's 'page thumbnails' pane and those pages will be copied to the second file.

Regards,
Rahul