Google Analytics has introduced the capability to process item-specific custom parameters from ecommerce events occurring on your website or app. When establishing a custom dimension or metric, you need to supply the name of the custom event parameter or custom user property that Analytics will link to the new dimension or metric. Prior to creating custom dimensions and metrics, Google recommends utilizing the default dimensions and metrics. To learn how to archive or set up custom dimensions, visit the Analytics Help guide. Custom dimensions and metrics provide valuable insights that can enhance ad campaign performance, improve targeting, and ultimately boost return on investment (ROI).