Click the Par. sections button in the Definitions dialog (Groups tab for steel / aluminum sections), the following dialog displays:
The following section types are available in the Section type field, in the upper right-hand corner of the dialog:
I-section 
box section (rectangular pipe).
When selected, a schematic drawing of the selected section type and the symbol convention for dimensions is displayed. The Definition of sections field defines steel / aluminum section dimensions.
To define a new section:
- Click the New button (a new line is created).
- Enter the required parameters in the table.
To delete sections from the list:
- Select the section or sections.
- Click the Delete and Delete all buttons.
There are two types of sections:
- Varying section (dH)
- Varying section (auto).
The Complex section tab defines complex members.
If the defined sections are to be included in calculations, "move" them to the Sections included in calculations field. There are two ways to include defined sections:
- adds the selected section (highlighted in the list) to the list of sections included in calculations 
- adds all sections from the given tab to the list of sections included in calculations
Recognizing sections in calculations: