Hi,
You are correct, the Security Test is associated directly with a TestCase. You can have more than one Security Test in one TestCase or you can implement different Security Tests differently in each of your 10 TestCases to test your service. You can organize the tests either way.
For the execution, I recommend you take a look at these articles, so you can decide what scenarios best apply to your testing:
http://www.soapui.org/Security/getting-started.htmlhttp://www.soapui.org/Security/working-with-security-tests.htmlRegards,
Giscard
SmartBear Support