Typically when I want to remove calls from a system profile I will create an application called "Excluded Operations" and then set an application definition to include all Web Calls that I want to remove.
Please note it might be important to set this application definition as a higher priority to ensure it is removed from your applications.
If you're referring to excluding third party calls that show up in user actions to google analytics you can create domain mappings in the user experience settings and set them to be "ignored" which filters out that domain from user actions. Is this where you are seeing these google analytics calls? If not could you please clarify and perhaps provide a screenshot: