Hello, define UTLH shaped curtains as a group. Never define a polygon column. The curtain group is defined as described below. U, L, T etc. To design typed curtains as a single element, the curtain group name line in the curtain settings is used. The curtains to be found in the same group are selected, the object settings are entered and a name is given to the group name line. If you want to define a curtain group after the building modeling is completed: -Select the curtains that will be included in the curtain group. -Press CTRL+B keys. Curtains will be selected on all floors. -Make the perspective window full screen and make all floors visible. -Press CTRL+E key. The curtain settings dialog will open - Give a name to the group name line. - Click the OK button. Select 'Short head curtain' option from the properties of your curtains that do not provide 1/6 aspect ratio in the group. After the analysis, the wall design results can be seen in the Curtain Group Reinforced Concrete dialog. Curtain group reports; You can create the Report/Screen Group line in the classic menu by clicking the Reports/Reinforced Concrete/Curtain Group icon in the ribbon menu. Good work.