Dialog Box: Symmetry [ Input Menu - Control Window - Transform Dialog ]
The authority and source of information for crystal symmetry is normally the International Tables for X-ray Crystallography . However, any space-group symmetry may be used for the atoms. There are two options for selecting or entering symmetry information.
Space group from table - Choose a space group by symbol or number.
Custom Symmetry (xyz) - Enter all the individual operations as fractional x,y,z coordinates in the unit cell.
Each choice calls up a sub-dialog.