Explanation
Three actions that are applicable when extending a default Salesforce B2B Commerce page via a page include are:
* Create the VisualForce page you wish to include to the Salesforce B2B Commerce page. This page will contain the custom content or logic that you want to add to the existing page. For example, you can create a VisualForce page named MyPageInclude that displays some additional information or functionality on the product detail page.
* Create a configuration setting for enabling the page include and assigning the new page include via CC Admin. This setting will specify which page include you want to use for which page and section. For example, you can create a configuration setting named CO.MyPageInclude with the valuePDV.BodyIncludeBegin.MyPageInclude, which means you want to use MyPageInclude as the body include begin for the product detail view (PDV) page.
* Build and activate a new configuration cache setting via CC Admin. This action will refresh the cache and apply the changes to the storefront. You need to do this whenever you make any changes to the configuration settings or VisualForce pages. Salesforce References: B2B Commerce and D2C Commerce Developer Guide, Page Includes