The decision to move from Excel to dedicated BOM management software is often made after one too many near-misses: a wrong part ordered because someone was working from an old spreadsheet, a cost overrun that wasn't caught until after delivery, a late machine because nobody noticed a supplier was behind on a critical component.
Once the decision is made, the next question is usually: how do we actually make the switch without disrupting ongoing projects? This guide provides a practical, step-by-step migration plan for small manufacturing and assembly businesses.
Before You Start: What to Expect
Switching from Excel to purpose-built BOM software is not a rip-and-replace exercise. You do not need to migrate all historical data before starting. One practical approach is to start with one new project, run it through the new system from the beginning, and expand from there.
You should also expect an adjustment period. Any new tool takes time to become habit, so give the team space to learn the new workflow.
Step 1: Prepare Your Supplier and Customer Data
Before importing any project BOMs, set up your supplier and customer data. This is the foundation everything else builds on — part prices, purchase orders, and spare parts quotations all reference your supplier database.
From your existing Excel files, compile:
- Supplier names, contact details, and account references
- Customer names and contact details
- Any standing pricing agreements
This doesn't need to be exhaustive — start with your 10–20 most frequently used suppliers and add others as you go.
Step 2: Import Your First Project BOM
Most BOM management software supports Excel or CSV import. Take your most straightforward active project — not the most complex one — and import its BOM as your first test.
Key things to check after import:
- Part numbers and descriptions have transferred correctly
- Quantities are correct (particularly quantity per machine vs total quantity)
- Assembly structure is preserved
- Supplier references are linked correctly
Review the imported BOM against your original spreadsheet. Any discrepancies are worth fixing as part of the migration review.
Step 3: Set Up Stock
Enter your current stock levels for components used in the active project. This enables the system to automatically calculate what needs to be ordered versus what can be drawn from stock.
You don't need to enter stock for every component in your warehouse — just the ones relevant to current and upcoming projects. Build the stock database gradually as you process more projects.
Step 4: Process Your First Purchase Orders Through the New System
The real test of any BOM software is whether the purchase order workflow fits your requirements. For your pilot project, generate all new purchase orders through the new system.
Compare the process to your previous Excel-based workflow:
- How long did it take to generate a PO?
- Were supplier references correctly populated?
- Was the delivery address automatically included?
- Did the PO look professional enough to send directly to the supplier?
Step 5: Track Deliveries and Update Status
As parts arrive for your pilot project, mark them as received in the system and observe how the BOM and stock levels update automatically. This provides a live view of what's arrived and what's outstanding.
Step 6: Review and Expand
After completing the pilot project, review what worked well and what needs adjustment. Then expand to your next project — ideally a slightly more complex one.
At this point, you can decide whether to migrate historical project data based on whether the team needs to reference old BOMs regularly, and plan how to retire the Excel-based process.
Managing the Transition Period
During the transition, you'll inevitably be running some projects in the old system and some in the new one. A few practical tips:
- Clearly communicate to the team which projects are in which system
- Don't try to run the same project in both systems simultaneously
- Set a target date for all new projects to start in the new system
- Keep the old Excel files archived but read-only — this removes the temptation to continue updating them
Common Migration Mistakes to Avoid
Trying to Migrate Everything at Once
Attempting to import all historical projects, all stock, all suppliers, and all active BOMs simultaneously can make a migration difficult to manage. Start with a defined scope, review the result, then expand.
Waiting for Perfect Data
Your Excel data may not be perfectly clean and consistent. Import a defined set, review it, clean it up as needed, and expect the first few imports to need some manual tidying.
Not Involving the Whole Team
BOM software depends on everyone who needs the data using the same system. If the purchasing manager uses the new system but the project engineer continues working in Excel, you'll have two sources of truth to reconcile.
Conclusion
Moving from Excel to dedicated BOM software is a process change that benefits from a defined pilot and clear ownership. Start simply, review the workflow, and expand methodically.
AssembleFlow supports Excel and CSV import. Our support team is available to help with questions during your transition. Start your free 14-day trial today.
Frequently Asked Questions
How long does it take to move from Excel to BOM software?
You can start with one real project in an afternoon by importing its parts list. Plan a few weeks to move the whole team and tidy the first imports.
Can I import my existing Excel BOM?
In AssembleFlow, yes. It imports CSV, XLSX and XLSM files: you choose the sheet, confirm the header row and map the columns.
Should I migrate every project at once?
No. Pilot one active project, review the workflow with the team, then expand. Keep finished projects in Excel as an archive.
Free tools: the Excel templates (BOM, PO tracker, cost and quote worksheet), the margin calculator and a product tour need no sign-up.