That isn't really a question, more a statement of your desire/intention ... hence, I suspect, the lack of replies.

I think you first need to decide what information you will need at each stage ... and that would be the basis for the headings you would need for a record relating to a quote (and subsequent sale detail).

This is more of a help forum and it's not really possible to help you until you have something to work on and some specific questions/problems.

If you want someone to design and build a solution, you could try posting a question in the Commercial Services sub-forum. Or you could employ a consultant to do the work for you, but that would be more expensive.

Excel works best with two dimensional tables of data, so one row/record for each quote. Don't be tempted to split information across multiple sheets as it becomes a nightmare to manage, analyse and report on.