This modification will extend the labor, material, and overhead for a BOM down through all sub-assemblies to give you the total labor, material, and overhead for a given item. Without this modification, the cost for a Stocked Sub-assembly will appear as just Material in the finished BOM. With this modification, you can see the true labor all the way down through all sub-assemblies.
When you run our new Roll Up Total Costs function, it will update the custom fields in Inventory. This breaks up the Standard Cost into Labor, Material, and Overhead. Those custom fields can then be used on several interactive views or added to reports.