Prices fluctuate. From time to time, you may need to adjust your prices for new market circumstances. The easiest way to create a new price list is to copy the existing pricelist, give it a new "valid as of date" and update the prices on the new copy. Lot Costing will automatically use the pertinent price list for all bodies processed from the new "valid as of date".
Go to References > Financials > Pricelist
Select the pricelist you want to modify.
Click on the tab Copy (see screenshot hereunder).
Don't forget to change the prices of each of the line items.