Hi all,
I'm referring to this paragraph from the official document https://docs.microsoft.com/en-us/dynamics365/supply-chain/cost-management/cost-groups#:~:text=The%20ability%20to%20retain%20cost,as%20a%20material%20cost%20contribution.
The ability to retain cost group segmentation across multiple levels in a product structure is known as splitting. Splitting applies only to manufactured items that use a standard cost inventory model. If splitting isn't used, the cost of a manufactured component is treated as a material cost contribution. The inventory parameter for cost breakdown by subledger indicates that cost group segmentation will be retained across multiple levels in standard cost calculations. By contrast, if a policy has no levels, cost group segmentation applies only to a single-level calculation. For example, the Cost rollup by cost group page displays the cost group segmentation across multiple levels for standard cost items.
And my understanding is: if the item group model of an item is STD (standard cost), then the single/multi level display in its Cost rollup by cost group page is expected to be the same (just like attached in the screenshot), unless customization or COC fix is used to enforce the cost to be broken down. Am I understanding correctly?

