Your best bet would probably be two alternating styles, one bold, one not.
Set each as the "Style for following paragraph" of the other.

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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
Word MVP FAQ site: http://word.mvps.org
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> I have a problem that should be relatively easy to solve with a macro
> or styles in MS Word, but I am only just learning how to use Macros
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>
> daryl