Use this procedure to remove cell assignments, frame assignments, and mullion assignments from a curtain wall unit style. You cannot remove default assignments, but you can modify them to suit your needs.
Note: Each grid requires one division assignment. Therefore, you cannot remove the division assignment, although you can change the division element used for the division assignment.
- Click

.
- Expand Architectural Objects, and expand Curtain Wall Unit Styles.
- Select a curtain wall unit style.
- Click the Design Rules tab.
- In the left pane, select the grid from which you want to remove an assignment.
- Select a cell assignment, frame assignment, or a mullion assignment.
- Click the Remove Assignment icon.
- Click OK twice.