You can find any tool by the Menu Structure HERE: https://turbocaddoc.atlassian.net/wiki/display/TC21UG/Menu+Structure
You can find the menu location of any tool by name HERE: https://turbocaddoc.atlassian.net/wiki/display/TC21UG/Tools+Mapped+to+Menus
Hemisphere
Creates a hemisphere (half of a sphere) with its circular base on the current workplane.Â
Note: A hemisphere is considered to be a Sphere object, and its Properties contain a Sphere page. For details, see Standard 3D Objects.
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- Select the center point of the hemisphere. The point will be created on the current workplane.
- Click to size the hemisphere, or enter the radius in the Inspector Bar.
The hemisphere is created on the side of the positive Z axis.
Local menu option:
 Downward: Creates a hemisphere in the negative Z direction, "below" the workplane.