How do you go about configuring for the sales order costing?

The flow is as follows:
Sales order -> Requirement Type-à Requirement Class-> All settings for
controlling
In a sales order you have a requirement type .In configuration, the
requirement Class is attached to the requirement type and in this requirement class all configuration settings are maintained for controlling.

In the requirement class we attach the costing variant, we attach the
condition type EK02 where we want the sales order cost to be updated,
and the account assignment category. In the account assignment
category we define whether the sales order will carry cost or not.

In case if we do not want to carry cost on the sales order we keep the
consumption posting field blank.

We also define here the Results Analysis version which helps to calculate
the Results Analysis for the Sales order if required.