If you are not worried about the section then you could just make the walls of the dome thicker.
If the cut was horizontal you could modify the shape of the profile to have a flat top.
You could still do this and the tip (rotate) the dome in 3D but you will have to extend the curve (profile) for the base of the dome and then cut that off flat.
If you had 16 it is very easy - Morph.
Barry.
One of the forum moderators.
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