To add a catalog cross section and assign it to selected members in your model, use the following procedure.

1. Select the Section tool in the Assign properties group on the Member ribbon tab.
   
   The Assign section dialog opens.
2. (Optional) If the section you want to assign has already been added to the model:
   1. Select Model from the Source drop-down list.
   2. Select the Section name and then proceed to step 7.
   Tip: Open the Model catalog to see the existing sections in the model. There you can also add sections with assigning them.
3. Select Standard from the Type drop-down list.
4. Select the catalog and section data for the shape you want to add.

   Property	Value
   Category	Select the material category: Rolled steel Coldformed Steel Aluminum Timber
   Country/Manufacturer	Select the country or the manufacturer name where the catalog shape is produced.
   Database	Displays the STAAD.Pro database name containing the section from the selected Category and County/Manufacturer. Note: Castellated rolled steel beams, R-Ceco rolled steel sections, European bulb flat sections, European flat bar sections, European solid square sections, steel joists, some cold-formed steel sections, AITC glulam sections, and aluminium profiles are not supported in STAAD.Pro Physical Modeler.
   Table	Select the shape table.
   Shape	Displays the shape type included in the selected table.
   Name	Select the shape name from the table.
   View Table	Click to open the selected database table in the Section Database Manager.
   Type	Select the shape specifications, depending on the shape type. For some specification types, additional parameters are needed.

5. (Optional) Assign additional section specifications if necessary: For example, you can assign composite concrete flanges, top plate, bottom plate, or other options then select that option from the Type drop-down menu.
6. (Optional) Select the Material Name to use for the section. The typical material associated with the section category (e.g., "Steel" for Rolled Steel) will be selected by default.
7. Click OK.