There are many ways to sum fields. Have you looked at any tutorials about creating PDF forms?
Yes there are, but those I tried for my purposes, did not work. I need to cumulatively add 1 week's "Earnings" into a "YTD" from week-to-week using a template for each employee. I thought I had it simply using the "sum" feature, but every time I input into a field, the YTD totals increased, even though they were not selected for that particular field's function.
This may not be possible.