When registering product information, you set the "Product Category" for Shopping ads to something selected from a list, but if you set the product type to a string that includes the parent category, it will be easier to create an automated collection with a parent-child structure.
Example of a product setting for a projector. The product type is "Parent collection category: Child Enter the structure up to "Collection Category: Product Category"
When creating a parent collection, set the condition to "Product type starts with" and enter the characters of the parent collection name.
Next, set the condition for the child collection to "Product type starts with" and specify the characters from the parent collection name to the child collection name.
