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Certain design code provisions require Torsional Analysis for Flexible Diaphragms. For these cases, the program calculates shear line forces on the current floor using applied loads on that level, modifies them for torsional effects, and then adds the shear line forces from continuous shear lines on the level above.
Forces from discontinuous shear walls on the level above are added to the level below as if they were a load and included in the torsional analysis. Therefore, only the applied loads on the level being analyzed and discontinuous forces from above are used in torsional analysis on the level below, but shear line forces from above are not.
This means that torsions are not transferred from upper levels to lower, as the diaphragms are assumed to be flexible and do not rotate as a unit.