To enable Grid Cell Pricing (Associated Simple Product Pricing) on the front end of the website for gridded items (configurable products) the attached extension must be installed on any NRO Migration Websites.
Once installed you can confirm that it is working properly by viewing the product page for a configurable product where the associated simple products have different prices.
When the option is selected in the drop-down the price that is is displayed on the product page is automatically updated
This price is the applied to the item when it is added to the shopping cart
Here is an example of viewing the grid cell pricing (associated simple product pricing) in the Magento Admin