I’d like to keep the consistency in design across multiple slide decks, by using the same template file.

But sometimes you have to modify the template and re-apply the modified template.

What’s the best way? I found the following article from the MS site, but it looks inefficient: Apply a template to an existing presentation - Office Support

It makes you copy and paste all your previous slide decks. It will also make it necessary to create a new file, which makes the workflow cumbersome if you store the file on the cloud and share with your co-workers.

Is there a simple way to apply a different template file, in a manner similar to attaching a diferent template file in Word?