Use frequency multi-loadcases to run multiple frequency response analyses with common
        modal results.
        
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                On the Main Menu toolbar, select .
            
 
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                Specify the modal results to which the analysis is linked.
                
The modal solution must exist in the current design study.
             
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                Specify the frequency span upper and lower limits.
            
 
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                Specify damping using Rayleigh damping coefficients or Modal damping.
            
 
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                Create Frequency Function.
            
 
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                On the workbench toolbar, select .
                
The new loadcase appears in the Project Tree.
                    You can apply loads in each individual load cases.