1. Decide which spreadsheet is authoritative
Before importing anything, identify the file that contains the most reliable customer, product, supplier or stock information. Do not merge every old spreadsheet simply because it exists.
Duplicate or contradictory source data should be resolved before migration where possible.
2. Clean the data
Standardise names, remove obvious duplicates, separate fields correctly and identify records that are no longer active. Bad data does not become good because it has been imported into a database.
Keep a backup of the original files before cleanup so nothing is permanently lost during the process.
3. Move one business area at a time
A smaller business can reduce disruption by moving customers and products first, then introducing quotations, jobs, purchasing or POS in a controlled order.
Choose an order that follows the real workflow so staff understand why each new module is being introduced.
4. Define roles and rules
Spreadsheets often allow anyone with the file to change almost anything. Business software introduces permissions, required fields and workflow rules.
Agree who may edit products, change prices, approve purchasing, process payments or manage users before go-live.
5. Run a short parallel check, not two permanent systems
For critical data, compare the new system against the old source during the transition. But set a date when the old spreadsheet stops being the operational record.
Running two systems indefinitely creates exactly the duplicate truth problem the migration was meant to solve.
6. Improve the workflow after stability
Do not try to automate every exception on day one. First make sure normal daily work is stable. Then improve reporting, permissions, mobile access, branch workflows and other advanced functions.
A staged rollout is often easier for staff to understand and easier for management to control.