Create a customised Excel spreadsheet that calculates

We would like to create an Excel spreadsheet to give to our clients about the cost of generating a piece of writing. We want a table with the following columns: Name of writing staffer Staffer's role in production process $ hourly rate time involved, hours OR time involved, minutes We want to be able to add more people to this and to generate a total hourly cost based on the hourly rates, hours, and minutes noted for each person.