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To move an object to another application or package, drag and drop it on the new application or package in the repository browser. Each object can only be part of one application or package so when objects are moved into a package they are no longer included in the application. See Applications and Packages for more details.
Streams
Multiple items can be selected using Ctrl+click to select individual items or Shift+click to select a range. To rollback multiple streams at the same time, select the streams required and then right click on a selected stream. The menu option 'Rollback Selected Objects' will be available to rollback all of the selected streams.