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Merge BigCommerce and Bonanza Sales Data for Multi-Store Reporting

Reporting on multiple storefronts only works cleanly once every store's export uses the same column layout.

Why BigCommerce and Bonanza exports don't line up

BigCommerce: an Order Date column that includes a full timestamp; Subtotal and Grand Total both included, which are easy to mix up when mapping; a numeric Order ID. Also, many optional columns are exported blank depending on store configuration, which can throw off auto-mapping by header position.
Bonanza: a sale date shown in the seller's account timezone; item price and a Bonanza final value fee that varies by advertising tier chosen per listing; an order ID unique to the marketplace. Also, fee amounts differ per listing based on optional ad placement, so two otherwise-identical sales can show different fee columns.

For multi-store reporting, that mismatch is exactly what causes hours of manual cleanup every period.

Open CSV Experts and set your target columns once (Date, Channel, Order ID, Total).
Drop in your BigCommerce export and map its columns once.
Drop in your Bonanza export and map it the same way — both merge into one sheet, normalized.
Export as CSV or Excel. Same-layout files merge automatically next time.

No. Everything runs in your browser using JavaScript — your files are never sent to a server.

Yes. Add as many source files as you want; each distinct file layout is mapped once and remembered.