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Yes, Google Tag Manager (GTM) can definitely help you track custom events like scrolls on your website. And you don’t need to worry about losing any previous data from your GA3 and GA4 accounts because migrating to GTM doesn’t affect your historical data. The past data will remain in your Google Analytics (GA).
You’re absolutely right about your GA4 property and GTM account having different IDs. That’s normal. GA and GTM are different tools with different purposes. GA is for tracking user interactions (like pageviews, events) while GTM is for managing marketing and analytics tags on your website. When you create these accounts, Google assigns different IDs to them to help you organize and separate your tracking tools.
So, what you need to do now is to configure your existing GA4 tracking within the GTM interface. Then you can start using GTM to deploy Google Analytics tracking on your website. Also, don’t forget to change the GA tracking code on your pages to the GTM code, and then remove the old GA codes.
Just make sure you set it up correctly, including setting up triggers (conditions for when tags should fire) and variables (additional information needed for the tag to work). If it’s done correctly, you can efficiently track custom events without losing past data and improve your future tracking system.
