I was just coming back to say that I think I figured it out. I created my sum statement like this:
sum(ParcelOne.Acres,ParcelTwo.Acres,ParcelThree.Acres,ParcelFour.Acres,ParcelFive.Acres,ParcelSix.Acres,ParcelSeven.Acres)
And it did what I needed it to do.
Once again, thank you for your help.