The only way to copy it, is using the import/export tool, but to achieve that, you have to create a subdomain first.
After that, install the WP and BeTheme using the same license key, because you can register unlimited subdomains with one license key, as long as the main domain is registered under the same key.
Then, import your desired pre-built website and use the tool I mentioned earlier.
You can import/export the page builder content with the import/export tool at the bottom of the builder, see screen: http://prntscr.com/h1emu4
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tool at the bottom of the builder, see screen: http://prntscr.com/h1emu4