Hi Venkat,
Costing run will give you the cost details of material related to a plant when you run CK40N. Here, you have two ways to show the costing details to your client.
While executing CK40N, without saving the data can get all the materials costing details on the screen. With this, any changes and adjustments you can do it based on the legacy price.
Other way is save the data if client satisfies and check the reports as Hurshi mentioned above. Later, if you require any changes in the costing, can be done and save again.
Whatsoever, values will be updated the matrial master when you release it through CK24.
BR, Srinivas Salpala