My view is SharePoint is overkill and a waste of money. Place the file on your shared common folder.

Tracking changes will be "easy" and seamless. The users will never see it or know.

The first step is to know what your project looks like. What is the purpose, what is the goal, how do you perceive it should function?

This forum allows you to post code and the sample workbook for review.

So ... wadda got ?