The load combinations are based on Clause 7, "Factored Loads and Safety Criterion" and Table 13 of Supplement No. 1. If notional load cases have been analyzed, they will be included in the load combinations. When the load combinations are generated, an option is given to generate the combinations such that when the load combination contains a lateral load case (wind or seismic), only the notional load that is concurrent with the lateral load case (i.e., in the same direction) is included in that combination. If that option is not selected, additional sets of combinations will be generated containing notional loads acting in each of the four global axis directions for each lateral load case. It does not appear that the code requires these additional load combinations, so generally the option to combine only in the direction of the lateral load case should be selected.