Use this procedure to assign a division to a curtain wall grid. A division defines the grid orientation (whether the direction of the grid cells and mullions is horizontal or vertical) and the division type (number and size of cells).
After you define a division, you can assign it to the primary grid or to nested grids. Nested grids are created by selecting Nested Grid as the cell assignment.
The name of the grid you select is displayed in the table under the Division Assignment row.