Create review "families" to share review content across multiple products. This can be useful if you have variations of the same product represented by different pages in your store.
For example, you may have a product that's available in three different sizes. Each size may have its own page in the store. Using Family Reviews, these products can share review stars and content regardless of which size the reviews were originally written for. Customers will see all reviews collected for the item regardless of the size they are viewing.