Use the destination store as the baseline
Export a small current product set, preserve its headers and row structure, and document every source-to-destination field mapping. BigCommerce's Catalog API migration reference marks Name, Type, Weight, and Price as required for product creation; that API mapping is not a required-header list for your CSV importer.
Illustrative product field subset
This synthetic subset uses headers and uppercase boolean syntax observed in the public modern-format sample linked below. It omits other fields, including Weight, and is not an import-ready template. Keep the complete headers from your own export.
Item,ID,Name,Type,SKU,Price,Inventory Tracking,Current Stock,Is Visible
Product,,Synthetic Tee,physical,TEE,29.00,product,12,TRUECheck before importing
Confirm UTF-8 encoding, required values, numeric and boolean syntax, unique SKUs, categories, images, custom fields, and the relationship between Product and Variant rows. Test a representative subset first.
Compare the template with your planned import
Official BigCommerce guidance checked 1 October 2026.
Source: BigCommerce documentation
CSV shape reference: third-party public sample, not an official store export