"Creating a subdomain" is what that is referred to as. It depends on what you might have available.
If you have a cpanel then you might have the ability to add a "subdomain" which should also be an icon available from that cpanel control panel. This will cover the process of adding products.livingthehdlife.com to the hosting.
But im not sure your website has hosting. Was it built in website builder?
either way you should have the ability to setup any hosting plan or website builder under that exactly "products.livingthehdlife.com"