Sub Contracting: How Manufacturers Can Control Work Sent Outside the Factory

Not every manufacturing process happens inside the factory. Many businesses send material to outside vendors for machining, coating, heat treatment, fabrication, assembly, printing, polishing, or specialised testing. This is normal. The problem begins when material leaves the factory and visibility leaves with it.

Sub contracting control is the discipline of tracking what material was sent out, to whom, for which process, in what quantity, at what cost, when it should return, what actually returned, and whether the returned item passed QC. Without this control, teams depend on phone calls, manual registers, and supplier memory.

For manufacturers using AICAN Optiwise, subcontracting can be connected with inventory, production, purchase, QC, costing, and supplier performance so outside processing becomes visible instead of vague.

What Sub Contracting Means in Manufacturing

Sub contracting, often called job work or outside processing, means sending material, components, or semi-finished goods to an external vendor for a defined manufacturing operation. The company may provide raw material and receive processed material back. In other cases, the vendor may add material, labour, or service value.

The key challenge is ownership and traceability. The material may physically sit at the vendor’s location, but it still belongs to the company or affects the company’s production commitment. The system must know that it is outside and pending.

Why Manual Subcontracting Tracking Fails

Manual tracking usually starts with a challan, a register, and a follow-up call. That may work for low volume, but it breaks when many items, vendors, and processes are involved.

Common issues include material sent but not returned on time, partial returns not recorded correctly, process loss not captured, rejected material not separated, cost not allocated properly, and production plans assuming material is available when it is still outside.

The worst situation is when management asks, “Where is this part?” and nobody can answer quickly.

What a Good Sub Contracting Workflow Should Track

A strong subcontracting workflow should start with a clear outward transaction. It should record vendor, item, quantity, process, reference production order, expected return date, rate, tax or service details if applicable, and documents.

When material returns, the system should capture received quantity, rejected quantity, shortage, excess, QC result, and pending balance. If the vendor returns partially, the balance should remain open. If there is process loss, it should be recorded with reason. If material is rejected, it should trigger correction, rework, debit note, or supplier discussion.

The workflow should also connect to inventory. Material sent to a subcontractor should move out of factory stock but remain visible as stock at vendor location or material under outside processing.

Subcontracting and Production Planning

Outside processing can become a bottleneck. A part may be ready internally but delayed at the vendor. If production planning does not include subcontracting lead time, dispatch commitments become unreliable.

ERP helps by making outside process status visible. Planners can see what is sent, what is due, what is overdue, and what has returned. This allows better scheduling and customer communication.

Costing and Commercial Control

Subcontracting cost should be attached to the product or job. If outside processing is not captured properly, product costing becomes incomplete. This matters for quoting, margin review, and profitability analysis.

Commercial control also matters. Vendor bills should match actual processed quantity and agreed rates. If material was rejected or short received, the bill should not pass without review. Connecting subcontracting with accounts and purchase workflows reduces disputes.

QC After Return

Returned material should not automatically become usable stock. Some processes require inspection after return. For example, heat treatment may need hardness testing, coating may need finish inspection, machining may need dimensional checks.

A good workflow routes returned material through QC where required. Accepted quantity becomes available. Rejected or hold quantity remains controlled.

Where Optiwise Helps

AICAN Optiwise helps manufacturers track subcontracting as part of the same production and inventory system. Material sent outside can be visible, pending balances can be tracked, QC can be connected, and cost can be managed more accurately.

This reduces the common blind spot between factory work and vendor work.

Founder’s Note

At AICAN, we see subcontracting as one of the places where manufacturers lose visibility fastest. Material leaves the gate, but responsibility stays with the business. Optiwise is built to keep that responsibility visible until the material returns, passes QC, and moves to the next stage.

FAQs

What is subcontracting in manufacturing?

It is the process of sending material or semi-finished goods to an external vendor for processing or job work.

Why is subcontracting tracking important?

It helps track material outside the factory, pending returns, vendor delays, process loss, QC results, and costing.

Can ERP track stock at subcontractor locations?

Yes. ERP can treat subcontractor locations as controlled stock points so material remains visible while outside.

How does subcontracting affect costing?

Outside processing cost should be added to product or job cost for accurate margin analysis.

Where can I learn more?

Visit AICAN and About AICAN.