Pivot Table / Data Pilot is a powerful feature in spreadsheet applications that allows you to prepare reports from lists of data very easily. This will allow you to speed up preparation of reports that you have to generate as part of project management. Although the example I have created and the instructions I have listed out is specific to the timesheets from Redmine the concept can be applied for any lists of data. Once you get the hang of it you wouldn't want to prepare reports any other way. If there are questions please ask somebody around you who knows this well. We have at least one person each in each of our offices who knows this well.