Section 28(b) in The Companies (Cost records and audit) Rules, 2014
(b)Such statements shall also include details in respect of all major items of costs constituting cost of production of goods and services, cost of sales of goods or services and margin in total as well as per unit of the goods and services. The goods or services emerging from a process, which forms raw material or an input material or service for a subsequent process, shall be valued at the cost of production or cost of service up to the previous stage.
