Changes the finance history value of the specified ID. Usually you won't have to call this method separately if you're doing a call to studio:deductFunds or studio:addFunds. Look into passable arguments for these 2 methods to make sure you're changing the finance history properly via those 2 methods.
1 number month
the month to change the value for. Most of the time you should pass nil here.
2 string id
the finance type to change the value of.
3 number change
the value to change it by.
studio.financeHistory:changeValue(nil, "office_expansion", 1000000) -- increase the finance history value of the "office_expansion" ID, indicating that you made $1,000,000 this month by performing some kind of office action.