Dear HGJ, Good Morning.

Your explanation was good but I´m a little confused on how to arrange data on the worksheet.
Have you got a starter worksheet where we can work on it?
It will be easier.

Arrange data as you desire.
Create a little example with the waited results.
Don´t worry about formulas now.
Just type results.
The most important is to understand your real necessity to help you.

Save your model at a free site, e.g. www.4shared.com and put link here.

It will be a pleasure to help you on your task.