Follow these steps:
1. Create a new Custom Project
2. Create a Retester task
3. Clone that task
4. Change the Fitness criteria on the first task (i.e. from Net Profit to Ret/DD)
5. The Fitness criteria on the second, cloned task will now be Ret/DD
Not sure if this behavior is the same with other settings or not. Thought it would become apparent what's going on once you are in the code.
Ryan