If you want to execute something external from WITHIN QC then you will need to customize the workflow code within QC. Customization of workflow code is discussed in the Administrator Guide.
The OTA API is used to access QC data. It can be used by external applications, or it can be used within QC within customized workflows. I don't think the API really gives you any special help to access external/other applications from within QC.
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To add a new custom test type do we require to change the workflow using the adminstrator guide too or the custom test type APIs will suffice ? As i have tried using the custom test type guide but the name of the new test typoe is not appearing in the QC tests.