After you click Syles from the left pane of the Project Preferences dialog, the parameter options are as shown.
Use these parameters to define table styles for the table types available in the software (Bills of materials, Profile summary, Plate summary, and so on). The selection lists include all the styles defined in a project.
Click More… to open the Steel summary tables - style manager dialog.
At the bottom of the dialog are 2 buttons: Dimensioning styles and Description styles, which, when clicked, will open the dialogs Dimensioning styles and Description styles, respectively.