Hello Bob,
There are two ways how a single product can be displayed in multiple section. A single SKU can be linked to multiple Pages. Instead of creating a new SKU when you create a new product Page, select and existing one in the dialogue. This approach is only suitable for simple products. While the fields in the SKU are shared, like price and SKU number, the Page fields are not. If you use any Page type fields for your products I recommend using Page links instead.