andywar65 on "Moving one webpage to a different website"

Usually I start with WordPress Importer, then I copy files via FTP and eventually modify links directly in the database tables. Problems arise with plugins, as leejosepho states, it can take long to transfer items and options, data may be disrupted. The shop website probably uses plugins such as woocommerce, so be careful, eventually contact the plugin developer.
Another problem is that if you jump from one domain to the other, you may lose some of previous traffic. Make things happen gradually, drive traffic from the old to the new website, but don't dismiss the old one abruptly.