How to get design utilization ratio for each load case ?

Graphically there is no way to view the utilization ratios for multiple load cases simultaneously. GUI can only display the results from the last design set. In case you need to view the utilization results for each load case, you need to use multiple design commands in the editor each with its own LOAD LIST command as shown next.

…

LOAD LIST 1

PARAMETER

CODE AISC

FYLD 40

TRACK 2 ALL

CHECK CODE MEMB 1 TO 50

LOAD LIST 2

PARAMETER

CODE AISC

CHECK CODE MEMB 1 TO 50

LOAD LIST 3

PARAMETER

CODE AISC

CHECK CODE MEMB 1 TO 50

...

The ratio and design detail corresponding to each load will then be printed in the analysis output file. When design is carried out multiple times, the results for each can be included in the report by going to File > Report Setup > Items > choosing the Output option and selecting Steel Design Detail