Hi,
I would like to know if it is possible to change symmetry axis as well as symmetry middle?
You can change the axis in the Transform > Symmetry panel.
You can change the symmetry mode from the Tool’s center to the local mesh’s center with Transform > Local Symmetry.
Generally speaking, a mesh must be symmetrical along one or more of the axes in ZBrush’s worldspace to work with symmetry, so you want to do all your symmetrical work before rotating or off-setting the tool.
You can however set a custom pivot point, as illustrated in this video.
Poseable Symmetry can also be useful in some situations.
Thanks buddy !!! you are the best of best man