Production Order Operation QTY confirmation

Hello PP Experts,

I have scenario of Migrated Production Orders from Legacy(old ERP) to SAP where i want to confirm the Operation Qty with the Costs, as the costs are already done in the legacy system.

Example :

Order Number ABC123 with Order QTY 200

Operation 0010 - I want to confirm the qty of 100 for this operation

Operation 0020 - I want to confirm the qty of 50 for this operation

When i'm trying to do this in CO11N its still getting costed as there is Overhead costs. Overhead costs are not available in CO11n screen.

Can you guide me how to Confirm the Operation Qty without costs.

Thank You