I have to set Google Tag Manager on a Magento website that already has google analytics tracking on it. The main goal is to replace all the old tracking by Google tag Manager and Universal Analytics.
I would like to know the best way to achieve this goal.
Is it possible, in a first phase, to keep the existing google analytics tracking and to set up Google Tag Manager in the same time ? For example, I would like to be able to set remarketing campaigns in the tag manager.
Or do I have to delete all related google analytics code on the website and create new tags in the Google Tag Manager interface ?
Thanks in advance