You can create a trigger without basing it on a template. However, we recommend that you use a template as this will simplify reuse of your code and make your triggers more portable.
When using the PowerDesigner Eclipse plug-in, you can right-click a trigger in the Browser and select Edit in SQL Editor from the contextual menu to open it in the Eclipse SQL Editor. You can optionally connect to your database in order to obtain auto-completion for table names. The trigger definition is added as a .SQL file to the Generated SQL Files list in the Workspace Navigator.