Copying GP template

Hello Team GP

I am new to GP premium and trying this for the first time.

I am trying to duplicate the FRONTpage of UNO so i can create a child page and build out my sitemap without affecting the original template.

When I look up 'clone template' or 'clone page' in documentation, nothing comes up.
Same with GP documentation about child theme

If I add a new page, I cannot see an option to select the Frontpage as the template.

Perhaps I am using the wrong terminology, but my goal is to copy the front page many times to keep the look across the child pages.

Could you please advise?

Many thanks!