This only applies to AISC 360, the command is only available when that code is selected. With the Criteria – B1 and B2 Factors command, the user can specify whether or not to apply the B1 and B2 factors. Generally the option to apply B1 factors should be selected. Generally, if the model was analyzed without using the P-Delta option, the option to apply B2 factors should be selected. For braced frames, R_M should be set to 1.0, for moment-frame and combined systems it should be set to 0.85.