You can access Campaign URL options if you click “Show more settings” below the Networks section.
This is an advanced feature that has to do with third party software tracking.
All the tracking that you ever need is already built in and directly connected with Google Analytics.
Tracking template – the URL that you’re going to add in order to get all of the information that the ad contains and the activities of the visitor. You can get it from your third party software of the company that wants the additional tracking.
Final URL suffix – if you want to add any additional information on the final URL for tracking purposes.
Custom parameters – use it if you want to add a certain value that’s already within the ad