Tell me -functionality is quite helpful when you cannot locate the page action on a certain page (On current page...). For example on the item list/card, page action "Calc. Standard Cost". With the Tell me -functionality, you will find two results: one for the assembly items, and one for the production items. For both actions, the descriptions are the same. By trial and error, you will remember that the first search result is for assembly and the latter one is for production.

For usability, could these descriptions be more accurate.

Current description: "Calculate the unit cost of the item by rolling up the unit cost of each component and resource in the item's assembly BOM or production BOM. The unit cost of a parent item must always equals the total of the unit costs of its components, subassemblies, and any resources."

It is confusing, as it describes to be used for either for assembly or for production, though they are two different page actions, with different execution logic.