If your business is set up across multiple domains, you might want each of them to report to a separate Google Analytics property or view. There are, however, more than a few good reasons to have each domain report to a single view as well. If you’re not sure, it’s relatively simple to do both.
Custom dimensions allow you to take all kinds of data about your visitors and turn them into additional dimensions which you can use to segment data in Google Analytics. You can use these as secondary dimensions in standard reports, or as primary dimensions in custom reports. Step 1: Create the DataLayer in WordPress (or whatever