Interactive Results Tool

Hi guys,

I want to develop an interactive Excel charting tool which enables users to analyse customer satisfaction data themselves by choosing parameters through drop-down menus etc. I have already created a simple tool using a hidden data sheet and various formulas that read off them. What I would now like to do is to develop something that is a bit more advanced and I also want to minimise the work required to update the data sheet each month.

I'm prepared to spend some money on a book or online tutorial that would give me a kickstart but I've found it difficult to identify the best materials to invest in. There are so many sites selling interactive reporting courses etc but they all seem quite gimicky and salesy. Could anyone make any recommendations?

Kind regards

HA