I'm not an expert, but I have enough clear what you want to do, long ago I had created a management system for accounting for non-profit assaults. In my opinion you should create an APP A Budget (within which you then summarize the data of APP B and C, APP B - Budget Chapters and APP C Expenses on Chapters. With a structure of this type you can monitor exactly year by year the entries and exits through the summaries you will have on APP A and B. You will need to use some JS code but here you will find a lot of support.
Calculate a running total
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