Google Ads Testing Custom Dimensions to Enable Reporting Based on Your Business Structure

If you manage large or complex accounts or have extensive campaign naming taxonomies, Google Ads custom dimensions might help simplify your reporting efforts and campaign naming systems. Custom dimensions in Google Ads allow you to append annotations to your campaigns to report on categories and subcategories aligned with your business structure and goals.

It appears to be in beta and availability appears to be quite limited at this point. You’ll find it under the Tools dropdown in your account when it’s enabled. Google has more details on the help page here.