Slow moving stock report

Good morning all.

I've been asked to create a slow moving stock report but I can't seem to
work out how I can do that in report builder. The user only want parts
displayed where there's been no sale of in the last 6 months. Does anybody
have such a report that they would share? Any help would be much
appriciated (we're on v6 by the way)

Regards

Martin Horton
PRD Holdings Ltd