I start to work on a word document which uses several kinds of
autoshapes as graphical elements. There will be e.g. many rectangles
with the same color and shadow setting used as background for text
paragraphs. I want to use autoshapes because they give me more visual
control than paragraph formatting alone.

Now, what happens if after completing the document it turns out that
the autoshape line or shadow style should better be changed? Do I have
to select and reformat all hundred occurrences of each kind of
autoshape individually to maintain a consistent layout, or is there a
way that works like format styles: I change one instance and all others
of the same kind will follow?

Is there anybody who has an advice how this can be accomplished?