There are many reasons to add global code to your tag. This article addresses how (not why).

Launch the top-nav, and enter Tag Configuration
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Edit your live tag
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Find the pre-init section
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Paste your code in
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Then save the modal and your tag.

Your changes will take a while to propagate through the CDN – it’s unlikely to be instant and these times will fluctuate throughout the tag.

In Webtrends Optimize, you have the ability to create Draft tag configurations so you can check your work. You can activate these using the query string _wt.context=optimize: e.g. https://www.webtrends-optimize.com/?_wt.context=optimize:mydrafttag

This is the only place we recommend you add scripts. It’s the first thing to load, and ideal for adding items into the datalayer.

This executes just before your tests are evaluated, but some initial processes will have already happened.

This executes after the Optimize library has triggered and tests have been requested (but not run).