Hi Krishna,
Are the two Sales Orders of same type or different? If different then you can maintain condition records for separate sales order types to activate/deactivate your condition types. Even if the sales order type is same, then also you may be able to maintain condition records based on customers.
Please refer below link for maintaining condition records.
http://help.sap.com/saphelp_46c/helpdata/en/f0/b5d468077c11d3ad020000e8a5bd28/content.htm
Regards,