Hi Vinoth,
Your question is more generic, you will get the relevant information if you google it, please find below links for your reference.
Settlement of Maintenance Order
Settlement of an Order - Plant Maintenance (PM) - SAP Library
Configuration Steps
Inform the user about Business Closure
Business Completion of an Order - Customer Service (CS) - SAP Library
Once the order cost has fully settled, you will be able to close the work order.
Regards
Terence