To extract separate reports for all the run commands in a master test case, we need to follow the below steps:
1) Add required "run" steps in a Master test case
2) Go to Window-> Preferences-> General-> Test Reports
3) Now enable the option "Export test reports after execution" which also enables the option "Exports test reports for the test cases executed in 'run' steps" and select any "Formats to generate" (for ex:HTML)
If we select this option, after executing the Test case, the reports get saved in the "project:///saved_test_reports" folder