I created a nurbs sphere, rotated -90 on x and z axis. Then I created an isoparm in the middle of y axis, edit nurbs> detatch surface. After that, the whole circle is then selected and I can't select the bottom or lower half of the sphere, just the whole sphere.

Is there a way i can change topic? I just deleted the text from my previous question and put a new one here instead of spamming the forum.