Before doing this step, you should know the following:
The BSP Application Name of the app you want to extend
The OData service URL that contains the required extensions
In order to get the BSP Application Name for a given SAP Fiori app, please refer to the app-specific documentation.
For detailed steps, see the chapter Retrieving the SAPUI5 Application Project from the SAPUI5 Repository in the Developer Guide for User Interface Add-On at http://help.sap.com/nw-uiaddon
The project name in Eclipse for the SAP-delivered standard application should be same as the BSP application service name on the server. Use transaction SICF on the ABAP server to get the service name.