I read the question in two different ways. The second one was what Aleks has covered.
The first was "I created a page with template X, I should have used template Y, can I convert?". To which the answer is "no" - a template in Confluence is literally a template. When you create something from it, you get a page with preset stuff on it for you to edit. The template has nothing to do with the page after that initial population. There's no link between them, and changing a template has no effect on existing pages.
If you would like to convert an existing page to a template, you can copy the content from the page and paste it into the template editor. There is no automated way of doing this.
Hi my Community friends! For those who don't know me, I'm a product marketer on the Confluence Cloud team - nice to meet you! For those of you who do, you know that I've been all up in your Co...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs