Here you can build relationships between products. The relationship names need to be defined in Site Manager -> Development -> Relationship names. Please note that only relationship names enabled for the current website can be used when building relationships between products offered in your on-line store.
New relationships can be created after clicking the Add related document button. Listed relationships can be deleted by clicking the Delete () icon in the respective row. After clicking the icon in the header of the Actions column, a context menu is displayed, offering options for export of listed data to various types of files.
Further information about products can be found in E-commerce Guide -> Managing your store -> Products.