Adjusting Standard Costs

I know Navision has the Adjust Items Cost/Price batch job, but it automatically changes costs based on a percentage and only on the current date. Is there a method to adjust the Standard costs of several items on a non-percentage adjustment basis (ie entering each one independantly) and have it so it takes effect on a specified date? I had incorrectly assumed that the Adjust Item Costs/Prices could be run like the “Adjust Cost - Item Entries” by specifying a posting date. Thinking I need to read the manual again…and again. Cheers