On the Data Managers > Materials menu, under Windows, you can find a comprehensive array of glazing data that is used by the various OpenBuildings Energy Simulator calculations.
While we would strongly suggest filling in all the data for each glazing type, you should recognise that the menu contains disparate data in places, some of which is used by specific calculations/simulations only.
For example, the Solar Gain Factors are used for steady state calculations such as CIBSE Gain:
Note: The Solar Heat Gain Coefficient is analogous to G-value. Detailed information on the relation between Shading coefficients and SHGC can be found here.