Hi Padma,
The value qualifiers for transfer to Export Declarations are fixed in the GTS code (and working automatically without any BAdI code). You cannot add extra qualifier values and expect them to be transferred. The mapping of Condition Types to GTS Duty Types is provided for the transfer of Purchase Orders (Application MM0A).
It's not usually necessary to transfer any values other than Net Value and Statistical Value for Export Declarations. Perhaps you could explain what you are trying to achieve?
Regards,
Dave