make a cone in sheet matel, then make a flat pattern

I was able to do it creating a revolved wall 359.9 degrees around and then created a flat pattern by selecting one of the edges where the two ends meet.

Make a truncated cone as you describe. Go to 'Tools>Sheetmetal' and select to shell as the conversion method (you could do this manually with shell, but let the SM module do it for you). Then, in order to make a flat pattern, you have to rip it somewhere, put a break in it somewhere, so that it will 'unfold'.

Thanks fellows, I new there had to be a way.