- Google product categories so he can organize his campaign by different categories
- any value he chooses so he can organize his campaign by his own goals
- the brand of his product so he can organize his campaign by different brands
- the product’s condition so he can organize his campaign by new, used, or refurbished products
Explanation: Label that you assign to a product to help organize bidding and reporting in Shopping campaigns are called custom_label. You can use up to 5 custom labels and 1,000 unique values per product for each custom label across your Merchant Center account.
Read more here: https://support.google.com/merchants/answer/7052112