In earlier times, accounting was done manually. With the coming of computers and increased technological advancement, accounting is slowly transferring from manual to mechanical dependence. It saves a lot of time. Earlier, hours were spent on drawing the basic design of sheets and other financial instruments. But now, you have access to balance sheet templates, which have readymade categories and spaces for computing. Now, one just has to enter the amounts manually and all other things are done mechanically.
Next, how much detail do you need in your cash flow template Excel spreadsheet at the individual line item level? Is cash from financing sufficient or do you need equity financing, debt financing, interest earned, etc. Also how do you intend to handle depreciation and amortization, since these are non_cash items that are typically added back to the income statement entries when determining the cash effect.