Answers
What are custom labels used for?
Fields you define yourself to segment products into campaigns — usually by margin, season or performance.
The short answer
Fields you define yourself to segment products into campaigns — usually by margin, season or performance.
Google does not read them, you do. They let you split a catalogue so budget follows the products that actually earn, rather than spreading evenly across dead weight.
The most useful labelling we see: margin tier, best-seller status, seasonality, and price band.
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