How to configure a sales funnel?

How to configure a sales funnel?

Hi,

Anyone can help me, please how to configure a sales funnel? What I could find in the guide is not enough, or did not help to solve my issue. I could create a funnel, but it is an inverted one (customers on the top, leads on the bottom).
I have a drop down with three categories (leads, potentials, customers), and I get the current status in the funnel. And it is not supported to aggregate the individual statuses.

Thanks
G