Totaling Rows in a Board

I am building out our team budget in Monday. I’m doing so in a board, with each month set up as it’s own project within that board. I would like to create a row for each board that sums up the numbers in each of the red boxes in the screenshot attached. Does anyone have any tips? I’ve looked at questions here similar, but I can’t find a solution other than purchasing an app. Thanks!

Hi Taylor! Adding a footer or a column summary directly to the bottom of the highlighted columns in a sub-item roll-up isn’t possible at the moment.

But as a workaround, you can add a board view and use a numbers or chart widget to display the sum of these columns: