A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hello,
Welcome to Microsoft Community.
There is no automated process to merge two OneNote notebooks/sections or pages into one notebook/section/page. To merge two notebooks/section/page you need to copy (Ctrl + C) the entire content of one notebook/section/page and paste (Ctrl + v) into the other notebook/section/page to be merged.
Let us know if you need any other information.
Thank you.