The settings for any given Custom Animation are provided in the Custom
Animation palette of the Toolbox. If the direction can be reversed that's
where you'd find the option to do so, but I don't recall ever having seen
that type of setting for any of them.
Without knowing what custom animation effect is involved -- or even whether
it's an Entrance, Emphasis or Exit effect -- it's impossible to suggest
anything specific. The best I can offer is that there are some effects which
do have variations available as separate effects rather than as settings for
that one effect itself. Perhaps there is a similar effect that runs CCW or
you may be able to create the effect using the Path Animation tools. You do
have the option of reversing direction with animated paths.
HTH |:>)
Bob Jones
[MVP] Office:Mac