Hi Sandesh,
You have updated the question with answer itself. 
As Neeraj has mentioned, You need to change Pricing Type only from G to D.
Do you face any other challenges like, system determines multiple Pricing Procedure for same scenario and for 1 Pricing Procedure you want Tax to be re- determined and for another Not.
That only can be the case where you can not work on the same.
If that is the case, then try updating Pricing type against Specific Pricing Procedure in V/08.
Regards,
MJ