Multiple Load Eigenvalue Buckling

How can I do eigenvalue buckling for multiple load steps on the same geometry? 

Set up the static analysis with the load steps, then go to Analysis Settings. In the details, set “Restart controls.” The “Generate Restart Points” should be set to “Manual” and “Load Step” should be set to “All.” Then, drag and drop the first eigenvalue buckling onto the solution. You may repeat dragging and dropping eigenvalue buckling systems for the desired number of load steps. In Mechanical software, go to the first eigenvalue buckling object and set the “Pre-Stress (static Structural)” to “Pre-Stress Define by Time” and set the time value. Repeat for the other eigenvalue buckling objects. Solve the project.