"You can also create a custom outlining style or modify
an existing one using Stylist. Press F11 to evoke the Stylist
panel, switch to the List Styles section, right-click then on the
style you want to edit and choose Modify from the context menu. If
you want to create a new style from scratch, choose the New item
from the same context menu or press Shift+F11.
"Another approach requires a bit more work, but it allows you to
use OpenOffice.org Writer as a two-pane outliner. This solution is
based on the Outline Numbering feature which lets you specify a
hierarchy of heading styles and then manage them using the
Navigator. By default, OpenOffice.org Writer uses the built-in
heading styles (i.e., Heading 1, Heading 2, Heading 3, etc.) for
each level, but you can easily change that using the Tools ->
Outline Numbering dialog window."