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You can enter forces along the shear line directly, to modify the forces created by the automatic distribution of shear loads to shear lines. They represent a shear point load applied to the top of the walls on a shear line. A negative force means it will be subtracted from the automatically generated forces on the shear line. (It does not mean that it comes from a wind or seismic load in the opposite direction - you select the force direction for that.)
Direct shear forces can be used to model forces transferred from an adjoining structure.
Unlike loads, direct shear forces must be factored for with the appropriate load combination factors for wind or seismic loads combined with dead loads before being input.
As with shear loads, you must specify a wind direction. Seismic forces are assumed to act in both directions. You must also specify whether these force adjustments apply to forces created by the flexible or rigid distributions, or to both distributions.
Direct shear forces will survive small moves of shear lines, but will be lost with major adjustments.