How to add a template
To add a template, you first have to define the templatebinding in an existing or new templatebindings file. To do so, open the Template Bindings Viewer and select the existing templatebindings file you want to add the templatebinding to and click the Edit... button. If you want to add the templatebinding to a new templatebindings file, click the New... button to define a new template bindings file using the Template Bindings Editor.
After you have added the templatebinding to the templatebindings file, the templatebindings file is selected in the templatebindings combo box and in the templatebindings grid, the template file is shown in red, if the file doesn't exist yet. Select the row with the template file you added and click the Edit selected files... button. If the file doesn't yet exist, the designer will show you a message whether you want to create the file or not.
The template is then opened in the Text Editor.