With the current "Add task to list" feature, you can add a "linked copy" to another list. Currently this the "linked copy" is shown as a parent task in the other list. This is the case, even if the original task is a subtask.
-> It would be great, if you could add any task as a subtask of another task.
The original task would remain were it was. After adding it as a subtask of another task, it would be shown as a subtasks of that second task, too.
I hope you can understand my explanation.
How would we use this feature?: We are currently having tasks that represent products. Those tasks are in a list that belongs to this product and which contains other tasks.
We also have tasks that represent suppliers. I would like to add the "product" task as a subtask to the "supplier" task without removing it from its original location.