Last Updated: July 2026
| KEY TAKEAWAYS |
| • Outside processing costs — heat treating, plating, specialized machining — often go untracked at the job level, leaving manufacturers guessing at true production costs. |
| • Acumatica Manufacturing Edition lets you configure an outside vendor as a work center directly inside a production order routing. |
| • When subcontract parts ship, Acumatica automatically generates a purchase order; when the vendor invoice is matched, the cost posts straight to the production order. |
| • Manufacturers with subcontract tracking set up correctly can compare vendor performance, catch margin erosion early, and quote future jobs using real cost history instead of memory. |
You send a batch of machined parts to an outside vendor for heat treatment. They come back a week later. But somewhere between the purchase order, the production order, and the vendor invoice, nobody can tell you exactly what that outside operation cost per unit. Finance is guessing. Production is shrugging. And the quote you gave the customer three months ago is starting to look very optimistic. This is the manufacturing subcontract management problem, and it’s more common than most manufacturers want to admit.
What Is Subcontract Manufacturing in Acumatica?
Outside processing, also called subcontracting, is when part of your production process gets sent to a third-party vendor. Heat treating. Powder coating. Plating. Specialized machining you don’t have the equipment for. The work leaves your facility, happens somewhere else, and comes back as part of a finished or semi-finished product.
Here’s the thing: that vendor work has real costs. Labor at the outside shop, freight both ways, lead time delays when the vendor runs behind. But in a lot of manufacturing environments, those costs are tracked loosely at best, buried in a general purchase order that never gets tied back to the specific production order it belongs to.
The result? Your actual cost of goods manufactured is wrong. And you might not find out until you’re already bidding the next job at a loss.
Why Spreadsheets and Standalone POs Don’t Cut It
Tracking subcontract work through a standalone purchase order or a side spreadsheet records the spend as a generic vendor cost, not as a cost tied to a specific production order or job. Look, a lot of manufacturers handle subcontract work the same way they’ve always handled it. The buyer cuts a PO to the vendor. Parts ship out. An invoice comes in. Someone matches it to the PO and closes it out.
That process works fine until you need to answer a real question: “What did job #4872 actually cost us, including the chrome plating?” or “Which vendor is costing us the most on outside heat treat, and is it affecting our margins?”
Without subcontract operations properly tied to your production orders inside your ERP system, those questions take hours to answer. Or don’t get answered at all. And when you can’t see what an outside operation actually costs, you end up estimating from memory the next time a similar job comes through quoting. That’s how repeat work gets quietly underpriced, year after year.
Three warning signs typically show up when subcontract costs aren’t being tracked at the job level:
- Job costs don’t match the original quote. Actual production cost comes in higher than what was estimated, and nobody can point to the outside operation as the reason why.
- Vendor invoices sit unmatched for weeks. Payables has no clean way to tie the invoice back to the specific production order, so reconciliation becomes a manual hunt.
- No one can name the worst-performing subcontract vendor. Without cost and lead-time data tied to each vendor and operation, underperformance goes unnoticed until it shows up in a blown delivery date.
How ERP Systems Handle Manufacturing Subcontract Management
The right approach to manufacturing subcontract management is to treat the outside vendor as a work center inside your production order. When you set up your bill of materials and routing, the subcontract operation gets defined right alongside your internal operations. The system knows parts need to leave the facility, who they’re going to, what the expected cost is, and when they need to come back.
In Acumatica Manufacturing Edition, you can configure outside processing directly inside your routing steps. The subcontract vendor is tied to a specific operation on the production order, and when the parts ship out, the system generates a purchase order automatically. When the vendor invoice comes in and gets matched, the cost posts directly to the production order. No manual journal entries. No guessing about what job it belongs to.
This connects naturally to how work centers are configured in Acumatica Manufacturing, where each operation in a routing references a specific work center, including ones flagged as outside vendors. Microsoft’s help documentation on work center setup shows similar mechanics for Microsoft Dynamics 365 Business Central, which handles subcontract routing by letting you define outside work centers and link them to vendor records so purchase orders generate automatically from production orders.
What You Can See When Subcontract Tracking Is Set Up Right
When subcontract operations are properly tracked inside your ERP, the picture changes. You can see the actual cost of each outside operation against the estimated cost at the time you quoted the job. You can compare vendors on the same outside operation to see who delivers on time and who runs over on cost. And when you go to quote a similar job next month, you’re pulling real numbers from real history instead of estimating from memory.
That’s the difference between managing your manufacturing cost structure and hoping you got it close enough.
Frequently Asked Questions
What is outside processing in Acumatica Manufacturing Edition?
Outside processing is a routing step where a production operation, such as heat treating or plating, is performed by a third-party vendor instead of an internal work center. Acumatica tracks the vendor, expected cost, and turnaround time as part of the production order itself.
How does Acumatica automatically create purchase orders for subcontract work?
When a production order reaches a routing step flagged as an outside operation, Acumatica generates the purchase order to the assigned subcontract vendor. Once the vendor invoice is received and matched, the cost posts directly to that production order without a manual journal entry.
Does Microsoft Dynamics 365 Business Central handle subcontract manufacturing the same way?
Business Central uses a similar mechanic: outside work centers are linked to vendor records within the routing, and purchase orders generate from the production order. The underlying concept, tying subcontract cost to a specific job, is consistent across both platforms.
Which manufacturers benefit most from subcontract cost tracking?
Manufacturers who regularly send work to outside vendors for operations like heat treating, plating, coating, or specialized machining benefit most, especially when those outside costs make up a meaningful share of total job cost and directly affect quoting accuracy.
Ready to Get Your Outside Costs Under Control?
If your team is manually reconciling vendor invoices to production orders, or you genuinely can’t answer what a specific outside operation costs per unit, it’s worth a conversation. CAL Business Solutions has been implementing ERP systems for manufacturers for over 40 years, and we understand how subcontract operations work in the real world, not just on a spec sheet.
Contact us when you’re ready to talk through your specific situation.
By CAL Business Solutions Inc., Acumatica & Microsoft Dynamics 365 Business Central Partner serving distribution, manufacturing, and professional services companies across New England for more than 40 years. www.calszone.com
