A comma-separated value file (CSV) is a web-based text file that typically includes location information.
To add a CSV layer to a scene, complete the following steps:
-             Click Add Layers   on the Designer  toolbar. on the Designer  toolbar.
- Click  CSV   to open the CSV pane. to open the CSV pane.
- Provide the URL of the service in the Layer URL text box.
- Provide a name for the layer in the Layer name text box.
- Optionally, do the following to append custom parameters to requests made to the service:- Under Custom parameters, click Configure custom parameters to open the Custom request parameters pane.
- Click Add parameter.
- Provide the name of the parameter you want to append in the Parameter text box.
- Provide the parameter value in the Value text box.
- Repeat these steps for each parameter you want to append.
- Click Done to apply the changes and return to the CSV pane.The specified custom parameters are automatically applied to all requests made to the service. 
 
- Click Add to add the service to the scene.