Define Google Analytics Custom Dimension

Google Analytics' Custom Dimension feature provides a powerful way to combine custom data with  Analytics data. Here are a few steps to do it:

Create a GA account

• Go to Admin UI, click ACCOUNT dropdown, select 'Create new account
• Fill in account create form and click 'Get Tracking ID' 

Create environment specify property

• Under PROPERTY section, select 'Create new property'
• Fill in New Property form. You can use App Name for specific environment, like Staging, Dev etc.
• Click 'Get Tracking ID' for specified environment

Sample code to track traffic:

<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');

ga('create', 'UA-74922222-4', 'auto');
ga('send', 'pageview');
</script>

Create Custom Dimension

• In Admin UI, click 'Custom Definitions' under PROPERTY section
• Select 'Custom Dimensions', '+New Custom Dimension' button
• Give a name and specify scope, check active and hit 'Create'
• Follow the example codes to collect custom data

Sample code using javascript:

var dimensionValue = 'SOME_DIMENSION_VALUE';

ga('set', 'dimension1', dimensionValue);

View Result

• In Report UI, select Audience>Custom>User Defined
• From 'Secondary dimension' dropdown, select Custom Dimensions and your dimension name
• You should be able to see traffics group by each value of your custom dimension.