I have been using the same campaign layout but changing the information. The campaign report only shows that I have sent one campaign for the month when in fact I have sent several. Is there a way to keep using the same layout but see all the campaigns I have sent?

Copy and paste the layout into a new campaign is going to be your best solution at this point.

Building a campaign based on an old one is just basically resending an old campaign.

We may alter this functionality later, but for now, you can caopy the contents into a new campaign.