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Merge WooCommerce and Walmart Marketplace Sales Data for Cost of Goods Sold Tracking

Calculating cost of goods sold across channels requires item-level data lined up the same way regardless of where it sold.

Why WooCommerce and Walmart Marketplace exports don't line up

WooCommerce: an Order Date in whatever format your WordPress site's locale is set to; an Order Total that depends entirely on which tax/shipping plugins are installed; a plain numeric Order Number. Also, column layout depends on which export plugin generated the CSV, so two WooCommerce stores can produce different headers entirely.
Walmart Marketplace: an Order Date column separate from the ship-by date; item price and a separate Walmart referral fee; a numeric Purchase Order ID. Also, each order line can appear as its own row with a repeated order ID, similar to Shopify's line-item export.

For cost of goods sold tracking, 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 WooCommerce export and map its columns once.
Drop in your Walmart Marketplace 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.