It may occur that you want a given speech audiometric test to be summarized by a specific index.  For instance, you may want a spondee test to come with an SRT index and a monosyllabic word test with a phoneme discrimination score.  This can be easily done.

Go to the Format window of the speech audiometry test and click on the Manage stimulus materials button.

Now select the speech stimulus and click Edit.

Check the option ‘Use a specific index to summarize results obtained with this stimulus and pick the index you wish to connect to this test.

If you want to impose this index whenever this test is being displayed, make sure the proper checkbox is checked in the format window.