You've got a spacific and practical problem, and dealing with third-party costs in Odoo manufacturing ain't easy. Wanna tackle it? It's definitely do-able, but you gotta use a few features all together.

First off, think about using Odoo's subcontracting thing within the manufacturing module. Set up a subcontractor product in your BoM where this third-party service is something you buy. This way, you capture the cost right away - no extra manual entries needed.

Then, there's the whole distributing costs thing across your produced items. The Activity Costs feature can really help here. Create a workcenter to reflect the subcontractor setup activity with its own cost per hour. When you confirm these actual hours upon recieve, make sure to update 'em on the specific MO. This links directly to your Work Order and reflects the real-time costs on the product valuation once it's done.

Finally, yep, those numbers need to be real-time before moving on to inventory valuation. Check your routing configuration so the cost allocation is sewn into the cost of goods sold (cogs) during post-processing. You really don’t wanna be adjusting financials afterwards.

The tough part is making sure your team really gets how to do this right. Spend some time training them to reduce errors and improve accuracy. Reach out to Odoo support if a custom mod or extra setup seems necessary. I had to tweak things myself once, and honestly, having hands-on experience is vital for finessing your operations workflow.

Hi Ronald

I think you can use a service type item to be added separately with vendor bill using landed cost.

Landed cost on manufacturing orders will be able to add valuation of those services to the produced items in all Manufacturing Orders.