With style-based numbering, the default is to continue the list. What you can do is set up a multilevel list and have a higher level (which can be unnumbered) restart lower levels. See
http://www.shaunakelly.com/word/numb...g20072010.html. Note that the article uses heading styles as an example, but you can and should use other paragraph styles, since you are not dealing with heading numbering.