Extreme novice with MOI.

I'm trying to create a truncated cone with a spherical top.

I can create the two individual units, one cone the other sphere, and reasonably join them, but I don't know how to cut the top of the cone off to get the object.

See attached drawing.

The horizontal lines are scribe marks that are on the object, the vertical line shows the centerline of the object.

Any help would be appreciated!

Regards,

Bryan Wilburn