Describe the process of creating a custom variable template to handle complex data transformations.

Creating a custom variable template in Google Tag Manager (GTM) to handle complex data transformations involves several steps within the GTM Template Editor. The template editor allows creating reusable custom variables and custom tags. First, access the Template Editor by navigating to 'Templates' in the GTM interface and selecting 'Variable Templates' > 'New'. Define template information. In the 'Info' tab, provide a name for the template, a description of its purpose, and an author name. This information will help other users understand the template and its functionality. Define template fields. In the 'Fields' tab, define the input fields that the template will require. These fields allow users to configure the variable with specific value....