When you define or modify the structure of a stacked wall type, you indirectly change instance properties of the individual subwalls that compose the stacked wall.
When you specify the height, offset, top, and base of the stacked wall’s subwalls in the Edit Assembly dialog, you are also specifying the corresponding instance properties of the subwalls: Unconnected Height, Location Line Offset, Top Extension Distance, and Base Extension Distance, respectively).
The only instance properties that you can directly specify for subwalls are Room Bounding and Structural Usage. The remaining properties are inherited from the stacked wall type and are read-only.
Note that the wall type of subwalls is not able to be changed in addition to the instance properties of the wall. To change wall types used in a stacked wall, you must edit the stacked wall type.
To change the wall types used in a stacked wall, you must edit the stacked wall type. Changing individual subwalls to a different wall type is NOT possible.
To access the instance properties of a subwall within a stacked wall