>I'm developing a payroll system where the input is the number of hours (dayly, nightly, normal, extras) a person has worked each day.
>Is it possible to create a report with all the concepts generated and draw a table with the detail?, I mean, this would be like two report in one.

It sounds like a multi-child report. See if http://fox.wikis.com/wc.dll?Wiki~MultiChildFoxProReports comes close to what you want.