From the CBS tab of Control > Workspaces, click the Add Cost Item icon on the top left toolbar.
Select Create a new blank cost item, and then click Yes.
To specify the CBS position of the new cost item, first select an existing cost item from the CBS, and then click Add Cost Item > New cost item.
The New cost item dialog box opens to the Details tab. Enter the cost item details as needed.
When finished, click Save.