You can do this in Agenda to quickly create a reminder linked to a note:
- Use the keyboard shortcut ⇧⌘ R (Mac + iPad)
- Enter the text action \reminder (\rem + Enter is sufficient) anywhere in the note (Mac, iPad and iPhone)
- Click on “Insert” in the agenda menu and then on “Reminder”. (Mac)
- Tap the plus button in the keyboard bar, followed by tapping the reminder icon. (iPad + iPhone)
I hope I was able to help.