To edit a Pages template file

[jsx97]

I have a custom Pages template in my Documents folder. Is it possible to edit it somehow other than creating a new file from it and then saving it as a template with the same name there?

 

[chown33]

Create and manage Pages templates on Mac

Install custom Pages templates on your Mac and save a document as a template.

support.apple.com

Look under heading: Edit a custom template

Found by searching keywords: pages edit template