Answers
What is a supplemental feed?
A second file that overrides or adds fields to your main feed without rebuilding it.
The short answer
A second file that overrides or adds fields to your main feed without rebuilding it.
Useful for rewriting titles, adding custom labels, patching identifiers or applying per-market overrides — all without touching the export your store app generates.
It is the practical way to do feed optimisation when you do not control the primary feed source.
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