With the document open, choose File > Save as Template (from the File menu at the top of your screen).
Click an option:
Add to Template Chooser: Type a name for the template, then click Choose.
Save: Type a name for the template, then choose where you want to save it.
If you want to email the template to others or to yourself, save it to your computer. You can attach the template file to an email message.
You can install a custom template that you received as an attachment, by adding it to the template chooser in Pages.
Double-click the template file (it has the file extension “.template”), then click Add to Template Chooser.
Note: The template is already installed on all your devices and available in the My Templates category of the template chooser if you choose Add to Template Chooser when you create the template (and are using iCloud Drive while signed in to the same Apple Account).
You can set Pages to always on your Mac.
Choose File > New (from the File menu at the top of your screen), Use the Finder to transfer Pages documents