Customizing the metadata fields for the Page Properties is a common requirement in any Sites implementation. This video details the most effective way to accomplish this using features of the Sling Resource Merger.
The above video shows customizing the page properties for the We.Retail application in AEM 6.4 using various features of the Sling Resource Merger. It enables the following customizations:
Download a package that will install the finished extensions to the We.Retail Journal Site: