Edit the page in visual builder
In the bottom options ( “…” button) press the double arrow button and select export.
The name sets the file name you will download and save to your computer ready to use for the new site.
Then on the new site create a page, press the double arrow button and select Import.
Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.