There can be a column with collection titles. You can add product to these collections, or remove products from these collections using the Bulk Product Edit app.
1. The values in the column should be collection titles, which can be found in your store.
2. Products can only be added to or removed from "Manual" collections. (Smart/Rule-based collections cannot be updated this way)
3. If there are multiple collection titles, they should be separated by ;
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