DataSink Configuration Properties

Hi.  I would like to access the DataSink configuration properties.  I would like to run my testcase multiple times and have all the results put into a single Excel spreadsheet.  Right now things are working well but each testcase run is overlaying the results of the previous run.  I want to update the 'Start at Cell' value between runs.

I can see the configuration information --> testRunner.testCase.getTestStepByName("DataSink - Failed Tests").getDataSinkStepConfig()

Thank you,

Angie