The '2.3 DS1-Section 2.3 (LRFD)' design situation was automatically created when combining the load cases in Part 1.
Double-click the 2.3 DS1-Section 2.3 (LRFD) design situation item in the navigator. On the 'Design Situations' tab of the 'Load Cases & Combinations' dialog box, the 'Steel Design' option is activated and the second-order (P-Δ) theory is set. This method is applicable when designing steel members per AISC 360.
The serviceability design situation was deleted in Part 1. No changes need to be made. Click OK to close the dialog box.