This Omni Automation scripts appends or prepends user-entered task to the names of all selected tasks.
This set of Omni Automation scripts enables task dependency outside of the built-in sequential action group structure.
This Shortcut adds a task to OmniFocus and automatically applies a ‘Do’ tag. If run from the share sheet it adds the input as an attachment or note, as applicable.
These instructions will enable you to add an Omni Automation plug-in to OmniFocus, and optionally assign a keyboard shortcut on iOS/iPadOS