You can set your preferences for project references in Talend Studio. To do so:
From the menu bar, click Window > Preferences to open the [Preferences] dialog box.
Develop the Talend node and click Repository to display the relevant view.
Select the [Merge the reference project] dialog box to show referenced projects as part of the Job Designs folder.
Click Apply and then OK to close the [Preferences] dialog box.
For more detailed information about working with reference projects, see Working with referenced projects.