There should be the possibility to run testcases from testsuites of foreign projects. Cool sideeffect will be that project files could be smal and straightforward and could be separarted for a single...
Sorry, I just saw that with this TestStep its not possible with an other project, only within the same project
But this can be achieved by a simple 1liner groovyscript testStep
Create a new Groovy TestStep, with the following content:
testRunner.getTestCase().getTestSuite().getProject().getWorkspace().getProjectByName("TargetProject").getTestSuiteByName("TargetTestSuite").getTestCaseByName("TargetTestCase").run(context.getProperties(),false);