Example of plugin
Plugin was designed as unobtrusive as possible. You notice it only when you log into the administration. It writes whether all the relationships among products and categories are up-to-date and if not, how many were added. Simply, everything is automatic after enabling this plugin.
Example of Use
We have 3 levels of categories: Motorcycles> Pants> Leather pants. We insert product called Pants Yark 11th into the category Leather Pants. Normally, the product would appear in the category of Leather Pants only. That is extremely user unfriendly because the user migh also search in the category of Pants and Motorcycles. The VM relations plugin automatically takes care of it and displays all products from child categories in the parent category.