To Create a Constructed Sphere
By using the Sphere option, you can construct a sphere as a Best Fit through four or more points.
1. Click > 
Sphere. The CMM Construct tab opens.
Sphere. The CMM Construct tab opens.2. Select the parent reference Csys from the Parent Csys drop-down list.
3. Select 4 or more measure or construct steps of the following types:
◦ Point
◦ Circle (center)
◦ Cone (cone vertex)
◦ Sphere (center)
4. Click OK.