Two ways to split
“Pick pages into one PDF” builds a single new file from the pages you list — ideal for pulling out a chapter or a signed page. The other option saves every page as its own PDF.
Writing page ranges
Use commas between parts and a hyphen for ranges: “1-3, 5, 8-” means pages 1 to 3, page 5, and page 8 to the end. Pages are counted from the first page of the file, regardless of any numbers printed on them.