Here is a screencast showing guvnor rule template features
As you can see here, the Template Editor is an extension of the famous Rule Editor which now has a Template Data tab. On this tab you’ll find a grid having the template placeholders (a.k.a. “template keys”) as columns. So in your knowledge base you’ll finally add the rules generated by the drools-template module, using the data into the grid and the parametrized rule that you’ve created in the editor.