add task multiple times to same table (task variants)

EDIT: I didn't look good enough:

Hi,
I have a task that can be used in multiple ways depending on a parameter.
I can make variants of that task with different default values so I can use the same task in multiple ways.
But I noticed that I cannot add the same task multiple times to the same table. I understand that I cannot do that if they all use the same, of no, variant. But different variants should be possible I think!?
For now I will duplicate the tasks, unless someone has a more elegant solution :)