Hi,

please imagine the following scenario:

You create an issue with some subtasks in project A. Then you clone it with all subtasks and move the clone to project B.

Some time later you create a new subtask for the issue in project A. If you now want the new subtask in the clone too, then there's quite a lot to do because you can't move a subtask to another project.
What can be done is: clone the subtask. Convert it to a normal issue. Move it. Change to subtask. This ist quite a lot to do for such a simple action.

It would be really helpful to move subtask directly to another project because we need that very often.

Cheers and thx,
Irene