You can use cost planning with cost elements (detail planning) if you have exact information. This is mostly only possible in the later stages of a project.

Detail planning takes place on an annual basis and includes the planning by cost element of:

• Primary costs
• Activity input
  Planning activity input is the quantity-based planning of secondary cost elements on a project that uses activity from a sender cost center.
• Statistical key figures
  You can plan statistical variables, such as, the number of employees.

You need to save the values from the detail planning separately.