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In Google Tag Manager (GTM), it’s unfortunately not feasible to apply one set of tags and triggers to every client regardless of the domain. Tags and triggers are specific to each container which is specific to each website, meaning you have to individually specify them for every client. As for the issue of pushing a bunch of data into the data layer, it’s just how GTM works: it pushes event info into the data layer based on the activities on the website. If you want to push data into the data layer using JavaScript, you could use the dataLayer.push method to do so, yet you would need to implement this separately for each client due to the unique data structure of each website. As for reusing triggers and tags, when you create another container, it will always start as an empty workspace. You can, however, export a container (which includes the tags and triggers) and then import it into another container, which might help save some time.
