Hello I checked your file and it seems that it is better to put them in one column.
I am m.s of systems engineering and b.s of industrial engineering, and excel and vba expert. I have done similar projects and I am confident that I can do this project based on your requirements, I also accept revisions and removing errors and minor changes in future for free, whenever you are ready lets go. I have good command of English that I think can be useful for this project. I have a base of statistics, mathematics, accounting, cost calculating and finance that helps in this project.
Also if takes much less time then I am open to reduce my bid.