Kanboard Plugin to create Automatic Actions for subtasks. This Automatic Action will allow you to add a subtask when the task is moved to another column or upon Task creation within a column.
Create a directory AutomaticAction under the folder plugins
- Copy all source files in this new directory.
Since this adds a due date to the subtask, you may need to also have Subtask Due Date Plugin installed as well. https://github.com/eSkiSo/Subtaskdate