Select a task and click the Note icon in the main outline or inspector, or use the keyboard shortcut Command-' .
The is the default landing spot for all new ideas and "draft" tasks that haven't been assigned to a project yet. OmniFocus Pro 2.7.2
OmniFocus 2.7 for Mac User Manual - Menus and Keyboard Shortcuts Select a task and click the Note icon
Many OmniFocus users use the dedicated third-party app Drafts to write text first and then send it to OmniFocus. OmniFocus Pro 2.7.2
Every action or project has a where you can draft detailed text, instructions, or links.
Advanced users use Omni Automation scripts to move structured text from Drafts into specific OmniFocus projects or folders.