Additional parameters to the links in email delivery

Hi Team, 

i have some script inside the options which is adding additional parameters to the links inside each delivery template. the script in the options named : "rsnNmsTracking_ClickFormula_GoogleAnalytics_Dynamic" and its noted it as "Tracked-URL calculation script". 

So i want to know in the delivery template where is the option that is calling this script? I got to know that this scirpt is called in only few templates and not called in all the templates.