Build a large diamond-like structure

Adjust parameters to selected space group and corresponding settings, in this example large diamond-like crystal: Cubic, Face-centered, space group N°227 "Fd-3m (1)"
Select the object(s) to be inserted at crystalline position(s), in this example C atom(s), note that in atomes it is also possible to use molecular fragments inserted from the software library or from any project opened in the workspace. If needed adjust position, and / or occupancy, then remember to select the object(s) to be actually inserted when building the crystal by clicking on "Insert". Then simply click on "Build".

The 3D window is populated with the newly created structure, in this example a "20\(\times\)20\(\times\)20" supercell of pure diamond.