Hello the team and i where taking a look at your case and we found a solution for you, since you need to make a global trigger you will need to create some Global variables
in order to use them with your Global triggers.
but we strongly recomend you to develop your own plugin
Because when you develop your own plugin all your variables can be called in a global way, so you wont get into processmaker code, and you will have better chances in not messing with processmaker code which would result in processmaker malfunction that may cost you some time in reinstalling the tool.
you can follow the next URL in order to develop your own plugin:
http://wiki.processmaker.com/index.php/ ... evelopment
hope this information would be useful to you.