Add the ability to organize sheets in folders inside a workbook
We should be able to create folders inside the workbook to organize sheets better. This could help in a variety of industries, especially for accounting departments.
An example of this idea would be for an accounting department in a company with multiple locations. With folders, you could store transactions for all locations in a single workbook with each location having a folder and and each day in the month having it's own sheet.
It could also be used for a company with a single location but with many employees. You could have a folder for each department in that location and a sheet for each team in that department.