What actually happens in a migration
We start by mapping what your sheets actually hold — item masters, supplier and customer lists, and current stock — rather than assuming a clean export exists. Most businesses running on Excel have several versions of the truth: a stock sheet here, a separate purchase log there, and a WhatsApp thread that quietly overrides both.
Opening balances — usually stock, and any outstanding purchase or sales orders — get cleaned and imported first, because everything the new system reports afterwards depends on those numbers being right on day one.
Why opening stock is the hard part
Item masters and contact lists are usually straightforward to import. Opening stock is not, because it is where the disagreement between the spreadsheet and the godown floor actually surfaces. We budget real time for a physical count and reconciliation before go-live rather than trusting the spreadsheet figure blind.
Running both systems in parallel
The old sheets stay available, read-only, for a period after go-live — so nothing is lost while your team builds confidence in the new system, and so a discrepancy can be checked against the old record rather than argued about from memory.