Every custom manufacturer faces a complex data problem on a daily basis. When a customer orders a product that has never been built before, how do you tell your factory floor exactly what materials to get and what steps to follow? If your instructions are unclear, your workers will end up guessing. When workers guess, they get the wrong materials, they waste expensive inventory, and your profit margin completely disappears.
The absolute best way to handle this challenge in Microsoft Dynamics 365 Business Central is by treating your parts list as a highly flexible blueprint rather than a difficult historical document. Achieving this requires moving away from basic spreadsheets and utilizing advanced software features like Phantom sub-assemblies, precise Routing Link Codes, and automated Scrap Percentages.
Before we look at the exact system configurations, we need to clearly define the manufacturing model we are trying to optimize and the tools we are using to do it.
What is Make-to-Order Manufacturing?
Make-to-Order manufacturing is a production strategy where a factory only begins building a product after receiving a confirmed customer order. This is the exact opposite of a Make-to-Stock workflow, where a company builds thousands of identical items, puts them on a warehouse shelf, and waits for someone to buy them.
Make-to-Order facilities usually build highly customized or highly specialized items. Examples include custom commercial kitchen layouts, specialized utility trailers, or heavy industrial machinery tailored to a specific client.
The biggest operational challenge in a Make-to-Order environment is total unpredictability. Because every single customer order has unique specifications, you cannot rely on standard inventory forecasting. Your engineering team and your production planners need a software system that can adapt to rapid design changes without breaking your financial tracking or confusing the warehouse staff.
What is Production BOM?
BOM stands for Bill of Materials. In Microsoft Dynamics 365 Business Central, a Production BOM is a highly structured digital document that drives your entire factory floor.
An effective Production BOM serves three very specific purposes for a manufacturer. First, it identifies the raw ingredients. It lists every single physical component required to build the finished product. Second, it defines the exact quantities needed, which prevents your warehouse staff from guessing how much material to bring to the floor. Finally, it sets your financial baseline. By listing all the required materials, the software can calculate the expected material cost of the job before the workers even turn on their machines.
When setting up your system, it is important to know that Business Central offers two different types of parts lists. Choosing the right one is the first step to a clean configuration.
Types of BOMs in Business Central
Production BOMs: This is the heavy-duty feature designed for actual manufacturing. You use a Production BOM when the build process requires specific routing steps, like cutting, welding, and painting. It allows you to track machine time, human labor, and complex sub-assemblies. This is the required tool for a Make-to-Order environment.
Assembly BOMs: This is a much lighter feature designed for simple kitting. You use an Assembly BOM if your team is simply putting a pre-made laptop, a charging cable, and an instruction manual into a cardboard box. It does not track complex machine time or detailed factory floor routing.
The Best Way to Structure BOMs for Custom Jobs
A very common mistake companies make in Business Central is creating a brand new, permanent Item Card and a brand new Production BOM for every single custom order. If you do this, your database will quickly become bloated with thousands of obsolete items that you will never build again. It becomes impossible to search and manage.
The best configuration strategy is to use a modular template approach. You set your main product Item Card to use the Make-to-Order manufacturing policy setting. You then create a master template BOM that contains the standard base parts of the product.
When the sales team confirms a custom order, Business Central allows your production planner to apply the master template to the specific production order and modify it safely. The planner can delete the standard wheels, add the upgraded custom wheels requested by the customer, and save the changes. The Business Central ERP system tracks the unique material costs for that one specific job, but your permanent master database remains perfectly clean and organized.
Using Phantom BOMs to Simplify Complex Customizations
A custom product is rarely one hundred percent custom from top to bottom. A specialized industrial packaging machine might have a highly unique conveyor belt, but the internal motor assembly powering it is built the exact same way every single time.
If you list every single washer, wire, and bolt for that standard motor on the main customer order, the document becomes incredibly long. Your floor workers will get overwhelmed trying to read a list with five hundred components.
The best way to configure this is by using a Phantom BOM. You can create a separate parts list strictly for the standard motor assembly. When you attach that Phantom BOM to your main custom order, the system does something very clever. It automatically explodes the list in the background. It tells the warehouse to apply all the necessary tiny parts from your inventory, but it keeps the main instruction sheet looking clean and simple for your floor workers. They just see one line that says to build the motor assembly.
Connecting Parts to Time with Routing Link Codes
Managing physical space on a custom factory floor is incredibly difficult. If a large custom build takes four weeks to complete, you don’t want your forklift drivers dropping highly sensitive electronic control panels onto the work floor on the very first day. If those parts sit around for three weeks, they will get lost or damaged by welding sparks.
You need materials to arrive exactly when the worker is ready for them. You accomplish this in Business Central by configuring Routing Link Codes.
Your Routing is the digital list of labor steps required for the job, such as cutting, welding, painting, and final assembly. A Routing Link Code acts as a digital bridge between your physical parts list and your labor steps. You can configure the system to link the heavy steel beams to the cutting step, and link the sensitive electronics to the final assembly step. The warehouse software will now hold the electronics safely on the shelf and only ask the forklift driver to move them when the welding and painting are officially marked as finished.
Managing Physical Waste Using Scrap Percentages
When you are cutting custom raw materials, generating physical waste is an unavoidable reality of the job. If you buy a ten-foot sheet of specialized aluminum to cut an eight-foot custom panel, you have two feet of unusable scrap metal.
If your BOM states that you only used exactly eight feet of material, your inventory tracking will slowly become entirely inaccurate over the course of the year. Business Central allows you to face this reality honestly by using the Scrap Percentage tool.
You can assign a specific scrap factor directly to any material line on your Production BOM. If you know that cutting a specific grade of aluminum always results in a ten percent loss, you enter a ten percent scrap factor into the system. When Business Central plans the job, it automatically calculates the need to implement 10% extra material from the warehouse to cover the physical loss. Most importantly, it absorbs the financial cost of that wasted metal into the final price of the custom order.
Choosing the Right Flushing Method for Custom Builds
Flushing is the manufacturing software term for recording exactly when a part is officially consumed from your inventory. Choosing the wrong flushing method in a Make-to-Order environment causes major inventory headaches.
Forward Flushing subtracts the inventory at the absolute moment a job is started. For a custom build that takes several weeks, this makes your warehouse shelves look empty on the computer while the parts are still physically sitting there. Manual Flushing requires a worker to use a barcode scanner every single time they pick up a part. This is highly accurate, but it severely slows down your production speed.
The smartest configuration for custom manufacturing is a hybrid approach. You set your cheap, bulk items like standard bolts and welding wire to Backward Flush. This means the system simply assumes those cheap items were used when the job is marked complete. However, you set your highly expensive, custom components to Manual Flush. This hybrid setup ensures your team accurately tracks when high-value items are consumed, without wasting time reviewing low-value inventory.
Common BOM Setup Mistakes to Avoid
Even with the best planning, setting up production data can be tricky. Here are three common configuration mistakes custom manufacturers make in Business Central and how to avoid them.
First, forgetting to certify the BOM. In Business Central, creating a parts list is not enough. You must manually change the status of the Production BOM to "Certified" before the system will allow you to use it on a factory order. If your planners forget this step, the floor managers will get an error message when they try to start the job.
Second, ignoring unit of measure conversions. This is a quiet profit killer. If your purchasing department buys steel wire by the pound, but your engineering team writes the BOM asking for steel wire by the inch, the system will get confused. You must set up clear unit of measure conversions on the Item Card so the software can do the math correctly and deduct the right amount from your inventory.
Third, cluttering the BOM with shop supplies. You should not list safety glasses, cleaning rags, or standard lubricating oil on a Production BOM. These are indirect shop supplies, not direct materials. Listing them on the BOM forces the system to track them unnecessarily, which slows down the software and creates administrative headaches for your purchasing team. Treat those items as overhead costs instead.
Closing Notes
A custom product manufacturing firm needs to operate with precision. If your digital blueprints are messy, your physical shop floor will be too. Getting these specific Business Central configurations right is the only way to protect your profit margins on complex builds.
As an Authorized Microsoft Dynamics 365 Implementation Partner, Cherrie Business Solutions helps manufacturers lock in these exact settings. We provide a high-class ERP software solution that actually matches the reality of your physical floor. Reach out to our team when you are ready to build a better, more profitable workflow.