1. Open one PDF.
2. View the PDF in thumbnails.
3. Select the pages you would like to export and then tap "Extract" on the top menu bar.
4. Set up the output folder. Then tap "Extract" to save them as a new PDF.
6. Advanced tip: To export pages, you also can drag the selected pages from the PDF Reader Window to your desktop(or the Finder folder) to create a new PDF.