Customers change requirements, engineering updates revisions, and your team has to react while jobs are already in production. When those jobs are built from a multi-level BOM, especially with phantom subassemblies set to With Top, updating the structure on an open order can be difficult if you do not have the right tools in your ERP.

The Add Multi-level BOM button in Cetec ERP gives production teams a controlled way to re-add a multi-level BOM to an existing order line, adjust subassembly revisions, and keep phantom subassemblies tied to the top-level assembly. Understanding how this button behaves helps you correct orders quickly without rebuilding the job from scratch.

Why Multi-Level BOM Changes Are Difficult on Open Orders

When you place an order for a multi-level BOM in Cetec ERP, you decide how each subassembly is handled at commit time. You can build subassemblies on their own production orders, pull them from stock, or include them With Top so that all of the material for that subassembly is rolled into the pick list for the top-level assembly.

If a subassembly is set to With Top and treated as a phantom BOM, no separate suborder exists. That works well during normal production, but it creates a problem if you later realize that the subassembly revision needs to change. There is no suborder where you can simply use the Change Rev feature, because the subassembly is embedded in the top-level pick list.

How the Add Multi-Level BOM Button Works on Production Orders

The Add Multi-level BOM button appears on a production order line when that line is a Build line tied to a BOM. Instead of manually rebuilding the structure, you can use this button to pull the full multi-level BOM back into a commit-style window and re-choose how each subassembly will be handled, including changing revisions where needed.

Step-by-Step: Update a Phantom Subassembly Revision

Consider a production order where the original commit treated a subassembly as a phantom BOM, set to With Top. You later learn that this subassembly needs to be built using a different revision than the one originally selected. Because there is no suborder, you cannot use Change Rev directly on that subassembly.

To correct this, you re-add the top-level assembly to the same order as a new Build line and then use the Add Multi-level BOM button for that new line. This allows you to select the correct revision for the subassembly and still keep that subassembly set to With Top so that its components remain rolled into the top-level pick list.

From the order edit screen, choose Add Line and select the top-level assembly again. Make sure the transcode is set to Build so that Cetec ERP treats the line as a production order for that assembly and exposes the Add Multi-level BOM option.

Enter the BOM with the updated revision selected, confirm the line is set to Build, and then click Add Multi-level BOM. Cetec ERP opens a window that shows all subassemblies under the top-level assembly, including the one that was previously treated as a phantom.

In the multi-level commit window, choose the correct revision for the affected subassembly and set it to With Top again so that its material remains part of the top-level pick list. For any other subassemblies, decide whether they should be built separately, pulled from stock, or also included With Top, then click Commit to Order to finalize the update.

When to Use Add Multi-Level BOM on Production Orders

Use the Add Multi-level BOM button when you need to change subassembly revisions or handling choices on an existing production order line for a multi-level BOM. It is especially useful when phantom or With Top subassemblies were committed incorrectly and you need to correct them without disrupting the entire order or manually rebuilding the BOM structure.

If your goal is only to adjust quantities or make small edits to a top-level BOM, normal order editing may be enough. Reach for Add Multi-level BOM when you need structured visibility into the full BOM, including subassemblies, and want those changes to flow cleanly into pick lists and material requirements.

Key Takeaways

• Add Multi-level BOM exposes the full multi-level structure for an existing Build line so you can revisit commit decisions.
• The feature is useful when phantom or With Top subassemblies need a new revision and no suborders exist to change them directly.
• You re-add the top-level assembly as a Build line, click Add Multi-level BOM, choose the new subassembly revision, and keep it set to With Top if required.
• Using this approach keeps pick lists, revisions, and production records aligned without reconstructing the entire order.

Conclusion

Multi-level BOMs give you accurate structure and cost, but they also add complexity when customer requirements change mid-production. The Add Multi-level BOM button in Cetec ERP provides a practical way to revise phantom subassemblies and With Top settings on open orders. When your team understands how to use it, you can correct BOM decisions quickly while keeping production orders stable and documentation accurate.