Slice the top of a cone So I just started working with Blender 2.6 and the two books I have don't really discuss how to modify objects other than "here's edit mode..."  

What I have is two cylinders with one slightly smaller than the other and protruding out of the larger one.  I need to "fillet" from the larger cylinder to the smaller one.  I decided to create a cone with the same diameter as the larger cylinder which then protrudes through the smaller one giving the illusion that the larger cylinder is reducing to the size of the smaller one.  Of course the problem is that the cone continues through and extends beyond the smaller cylinder.  My thought was to just cut a section off of the cone that lies inside the smaller cylinder.  Unfortunately my two books don't really cover doing anything like that.  So any suggestions would be greatly appreciated!
Use vertex bevel in edit mode.
To do that:

Press Tab to enter edit mode.

Right click the top vertex to select it.

Use vertex bevel (ShiftCtrlB) and use your mouse to adjust the bevel amount:


Press Tab to exit edit mode.