You can use the button to open the "Load Cases and Combinations" dialog box. The dead weight load case has already been created there. You can add a new load case using . Enter the name and the corresponding action category for each load case.
In this webinar, the cables on the left and the cables on the right were assumed as permanent live loads, and the walkway as a live load of Category F. In addition, wind loads in the +Y and -Y directions are considered.