There is apps out there similar but I would like to take it further. I am thinking of an app that does (vertical) calculations as a tape calculator. With notes on the side.
I have an awesome app I used. There much that can be implemented.  The ideas of grouping calculations sort of like apples to apples and oranges to oranges. The program can distinguish them by either starting a group and adding items together. Having visual up and down slides kind of like "Verizon app" or similar. Option for all groups to total. [Internal group subtotals option. Option to add custom functions after every row (side)hide unhide]. I guess depending on price I would give more info.

Thanks