How to create a template from an existing page
If a certain page can serve as an outline for other pages, you can save it as a template in two easy steps.
Step 1. Navigate to a page and click the kebab menu next to Share. Select Create template.
Step 2. The page will then be copied to the template editor. You can choose the Default Category for the template and make edits. Once you're ready, click Publish template.
To view and manage all your templates, click Team Settings / Templates: