Hey @Eren Hasip  Shauna here from Support! 

There is currently no way to ‘merge’/’unify’ multiple tags into one. This would be a feature request - I will go ahead and flag this with the Product team for you  

Please feel free to share any additional feedback on this in relation to your use case & I can pass this along! 

Is there any update on this? Or perhaps a workaround? I tried creating a view with multiple tags thinking I could then apply the same tag to all of them, but I also couldn’t find an easy way to simultaneously tag all of the conversations in the view.