To have the contents of a department drive to show up in your Google file stream (G:), do the following:

1. Go to drive.google.com.
2. On the left, click Shared with me.
3. Select the files or folders to which you want to add a shortcut.
4. Right click the files or folders you selected  Add shortcut to Drive.
5. Choose a folder.
6. Click Add shortcut.