Hi Manish
This could be done but not in standard system. You have to go for an ABAP program. Everything could be done on one click but for this you need to ask your ABAPER to do this for you. Tell him the logic and calculation. He will write the program and use some BAPIs.
For ABAPer. mYou could create a program and take current pricing data from KONV and A*** tables. Check in which table price is being maintained. Add exchange rate or whatever calculation user required. Save this new price in come notepad file and call a BDC upload program here which you have to create for VK11. This will maintain new price in relevant tables automatically. I know this is not an easy task but this is possible.
Thank$