[![enter image description here][1]][1]I am trying to get ModelBuilder to create a route for each row in a `.csv` file. Each row has one start and stop locations (Point A and Point B). I need to add both start and stop locations to a network layer to create a route. I then need to delete these stops, and iterate back through, creating a route for each record between each start and stop point. In the Add Locations tool help, I read that the Append Parameter might be what I need to use. In the tool dialog box, there is just a checkbox, but in the Python reference it says 

•	**APPEND** — Adds the new network analysis objects to the existing set of objects in the selected sublayer. 

•	**CLEAR** — Deletes the existing network analysis objects and replaces them with the new objects.  

I think I need to do both Append and Clear actions to get what I am trying to achieve but it is just a checkbox in ModelBuilder. 

Will I need to use Python code to be able to append, then clear, stops in an iterator model? 

I am not very strong writing Python Code and was hoping to use ModelBuilder to get what I need.

I added my model builder file for clarification. The problem lies in the Add Locations tool. It only accepts one pair of Lat/Lon coordinates

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/b3W58.jpg
  [2]: https://i.sstatic.net/1MCGr.jpg