To be able to actually use the structures as described earlier, it is necessary to define one of the atoms as having xyz-coordinates (0,0,0). This will then be the atom that will actually appear at the spot of the atom that is replaced by the structure.
Place a 'Methyl' structure in the drawing area Replace the hydrogen atoms by chloride atoms and pre-optimize Select the central carbon atom Choose Edit → Set Origin Save the structure in (a subdirectory of) your $SCM_STRUCTURES directory
The new structure will in the structures menu and can be directly used.
