Hi Richard-
The picture you are referencing will not work to link unconnected tables to your Customer’s table. You will need to build your “child” tables with a link from child to the parent table (which in your case would be the Customers table).
What you are attempting to use is a local storage variable and is used for more complex connections and not the best way to connect dependent information to a customer. If you’d like to understand the Local Storage concept a bit more you can view the video in the following posting that @moe created.
Hope this helps,
Adam