Cash Flow Calculations in MS Project

You can copy the info from the task usage page into Excel. Select "Cost" as one of the data options in the right side of task usage. Set your timescale as monthly. Hilight the top row (for cost)- this is a summation of all costs - and copy it to Excel.

I just did an Excel page for acumulated cash flows over the years for the project, say 35 years. (not in months) I think it must work the same way for months but I didn't try. You just make a few (3/4) inputs if they are the same for the next year or you adjust year by year. I think what you need is the formula. Mine is very simple and was never tested professionally, I did it this month. I don't have/never tried any other software. I don't now MS Project, I will. I am not shure if that is what you are looking for. Mine also gives the curve of cash flows on a graphic of the same (Excel) page.
Neat.