Copy/paste OmniFocus actions for iOS on iPhone?
If you click on an action or a project in the latest version of OmniFocus Universal for iOS, it provides a system share sheet that has a copy extension, which allows you to copy it as Taskpaper. That can then be pasted back into the application or you can use an application such as workflow to make a new project or action based on your copied data, which may be slightly more convenient.