How do I manage product data for retailers that each want a different format?

Hold one internal record with every fact at full fidelity, then treat each retailer’s template as an output mapping from it. Adding a retailer becomes a new mapping rather than a new copy of the catalog, and a corrected dimension updates every partner on the next publish.

The alternative — maintaining a spreadsheet per retailer — scales linearly in maintenance and guarantees drift. A correction made in three of five files is worse than one made nowhere, because nobody knows which files are current.

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