Process to eliminate the manual correction of new pricing on open orders.

When we update pricing on parts we need to go in view all open orders for that part and go in and manually change the pricing on that part. We need a process to make this automated. We can have anywhere from 1 part to several hundred parts to do this to and it does take time and errors occur resulting in discrepancies.
Is there a possibility, where we change the price on price list and it automatically gets cascaded to all open sales order lines?

Thanks
Mohan