Hi Barry,
You can delete the newsletter campaigns when creating a new campaign from the page that allows you to load a template, just click on 'X' to delete the campaign information that was there previously, which will remove the template information relating to that campaign.
You cannot delete campaigns that were sent from the 'sent campaigns' tab, as these provide you with the heat maps and information about the success of your campaign.
Hope this helps.
:-)
Proptrack Real Estate Software
www.proptrack.com