Apple Macintosh PowerBook 150 - Manual (Page 127)

To link files or folders, follow these steps:
1 Drag the icon of a file or folder you want to link to a selection box in the File Assistant
Setup window.
2 Drag the matching icon to the other selection box.
Once you have two matching files or folders in the Setup window, you have a
linked pair. Another pair of selection boxes appears. Repeat steps 1 and 2 to
link more pairs of files or folders.
The setup screen grows as you add to the list of linked pairs. Use the scroll
bars on the right of the screen to see parts of the list that are not in view.
119 Using the PowerBook File Assistant
Drag the icon of a file or folder you
want to synchronize to a selection box.
The selection box is this area on
either side of the arrow.