Google Shopping Custom Labels for Google Ads is a helpful attribute that allows you to define your campaigns at a much higher level.
|Item ID||custom label 0||custom label 1||custom label 2||custom label 3||custom label 4|
Using custom labels allows you to break away from the constraints within categories, product types, etc.
You are limited to a total of 1000 different values. Meaning you can use any other word or sentence in any of the five custom label columns. Each unique value in these five columns will be counted as one.
If we look at the table below, we can see that we have nine cells, but we only have six different values. Any value can be in any column, as long as the total for all five columns does not exceed 1000 unique values.
You can start by using your top-level Custom Label 0 than define it to a subdivision using categories, product type, brand, product id etc.
Or you can start with the top-level category then use custom labels down the tree. The combinations are limitless and allow you to define your product grouping in a very effective way.
Here is a guide on how to create product group subdivisions.
If you have many products, then creating multiple ad groups per product listing will allow you to searched keywords for that particular group. Enabling you to better control your negative keywords.
So, for example, I have two groups, Coffee and Juice. When I go inside dimension and select view searched keywords, I can use the filter option to change the specified group results.