Hi Susan,
One function is the Update Price List, and it can be found from the Edit menu and the Item Maintenance flyout. Though the 2 methods for updating the Base Price here (by a markup % or margin) are both based on the Standard Cost.
There is a Markup method of alternative pricing, either on the Master Item or an Alternative Price List item. These automatically markup over either the Standard Cost or Most Recent Cost. Not the Average Unit Cost, however.
A GridView view could be created to list the Base Price, Avg Unit Cost, Standard Cost etc - not only to check which items may have been missed, but also to export to Excel, do the calculations there, and re-import the Base Price (and Standard Cost) to update the items.
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Regards,
Softrak Tech Support