You can use the Browse Assets page to find an asset and add it to any active project:
From the Home page, click:
Operations > ATG Content Administration Project > Browse Assets
Use the Search or Browse tab to locate the desired assets.
In the results list, check the desired assets.
Note: the results list might require several pages.
From the two dropdown lists at the bottom of the page, choose:
Modify
An active project.
Check Take Me to Project.
Click Go. The project’s Assets tab displays.