3Ds Max - Symmetry
Symmetry
The symmetry modifiers, not only create a mirror image of an object for you, but also let you manipulate both sides in tandem in an intuitive way. Now, move one of the vertices on the left side of the box, where it overlaps the symmetry box.
Step1: create a sphere.
Fig.126
Step2: Click on modify tab and select symmetry.
Fig.127
Step3: After that, click on flip arrow of symmetry and pick mirror option then select X-axis of mirror axis.
Fig.128
Step4: click on x-axis of move icon and drag.
Fig.129