Hot answers tagged notes
If you use Google's Task List, you could add the message as a Task and add notes to that. "Add to Tasks" is under the "More" menu. It's then added to your tasks, with a convenient link to open the original email message. Then you can edit the task and add information to the "Notes" field.
Your question represents a longstanding gripe among Evernote users, myself included. While they allow merging of notes, splitting them is not supported, and neither is the creation of separate pages within a single note. (The closest you could get might be uploading a multi-page pdf into a single note.) Apart from Note Taker for OS X, I can't think of any ...
Only top voted, non community-wiki answers of a minimum length are eligible