create mailboxes in directories?

[David Lu <lulu lululand com>]

how do i create mailboxes inside directories, like
the screen shot on this balsa page:

http://www.balsa.net/screens/mainwindow.gif

i can't seem to do it through the gui, so i
guess this means i need to manually edit
balsarc.  is there any docs on what goes in
that file?

		- david -