In part family window in first objective is “Exportable part family template” is selected on, and got values below
1. Selected ON DB_PART_NO and OS_PART_NAME un-editable values will appear in chossen columns.
2. When Selected OFF DB_PART_NO and OS_PART_NAME un-editable values will go off and Part_Number will appear.
In both cases I am able to create child parts. What is the difference in two options?

I am creating part family in NX intigrated with TCE let me know whether Exportable part family template is to be selected ON or OFF while creating family