In general settings → advanced settings, select how you want to set up the title format for each item (each item corresponds to one variant).

For example, if your main product title is School Backpack for kids and you have 2 variants for it in total (blue and green). The setting below will append the main title with the variant title, "School Backpack for kids/blue" and "School Backpack for kids/green" to submit to your Google Merchant.

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