Select the event definition file, then click Import.
The Events Editor will now include the components and events from the external application. In the following example, the external application (named "ExternalApp") contains two components whose events your custom application can subscribe:
Subscribe to the desired events from the external application.
Note - The external application’s components / events can be removed from the Events Editor by clicking on the Remove button. This displays the Remove Files dialog from which you can select the desired event definition file for removal.