There are several ways to save certain pages of a PDF file. Here are some methods you can use:

1. Use an online tool like PDF Splitter to upload the file and select and save individual pages of a PDF.
2. Use your internet browser to save a single page of a PDF file.
3. Use Adobe Acrobat DC to save one page of a PDF.
4. Open the PDF file in the editing application, select "File" from the toolbar then "Print." Choose the page you want to save by entering the page number. Click "PDF" then "Save as PDF" from the drop-down menu. Select where you want to save the file.
5. Export a PDF page with a PDF converter.