Refurbishment order _Planned and Actual Costs

Dear Experts,

What are the controlling relevant setting to be done for a refurbishment order . Can we do it without costing sheet ? We have 2 scenarios . 1.Refurbishment of spares in-house 2. Refurbishment of spares externally.

Please explain the costing relevant settings and also give a example how the cost is calculated and how to trace the cost incurred for repairing a spare part.

Regards,

Ram