Hi Amit,
The Pricing procedure is determine on the Basis of Sales area, Document pricing procedure and customer pricing procedure from customizing transaction OVKK, for your case create two customer pricing procedure Local and Export, then maintain the same in customer master record and then assign the Local and Export pricing procedure determination in OVKK.
As you want to keep sales area common so for this you can use customer pricing procedure for differentiating Local and Export.
Regards,
Zafar