Thanks Adam, but as I already said, they are REPORT fields, not Method fields, so they do not show up in the fields list as fields that I can calculate with. If there is a way to calculate on REPORT fields I would love to hear it!
To clarify, what I have done in my report is used 3 label fields to add together three different amount fields from three different Method tables. I am hiding the 3 detail columns and so all you see on the report are three totals - Beginning Balance, Total Receipts, and Total Charges. I want to now take the value in the Beginning Balance REPORT field (which is a sum of a hidden field), add the Total Receipts (another sum of a hidden field) and subtract the Total Charges (third sum of a hidden field) to get Ending Balance.
Thanks!
Karen