a custom designed excel spreadsheet with weekly and monthly reporting

I'm looking for an experienced developer who can create a custom designed Excel spreadsheet with weekly and monthly reporting features. The spreadsheet should contain basic calculations and formulas, as well as the ability for easy navigation and understanding. The purpose of the weekly and monthly reporting is for inventory management, so it needs to be able to visualize all of the needed data in a logical manner. I am open to suggestions for the format of the reports but I need it to be easily understandable.