Shear walls can be modeled using surface elements. You can use the top menu option Geometry > Add Surface to define surface elements. Properties for surfaces can be assigned through General > Property > Thickness > Surface Thickness. The design of shear walls can be carried out through Design ( last page on the left within the Modeling mode ) > Shear Wall
Section 5.55 of the technical reference manual has lot of useful details on the shear wall modeling/design.
Section 5.55 of the technical reference manual has lot of useful details on the shear wall modeling/design.