Managing design updates to show existing client

hello!

I wanted to find out if there is a way I can show an existing client a site design update without duplication of the site. I was intending to change some of the font settings and navigation style etc. 

I was wondering if anyone had any experience with this particular scenario 🙂

Thanks in advance for the feedback and assistance!

Jonathan

With 7.1 version the only way is doing on main site or duplicate it