Running tests as part of a project.

If I have constructed 20 load tests in a project, is there any way of running this project but making it only execute tests 1-15, or 1-5 or missing out number 7 and 11 or whatever combo of the tests I want to run. It seems to me that you either run one test at a time or one project at a time. Or I guess I could have mutiple test cases set up within a LoadUI project and quickly click the ones I wanted to run (but thats not particularly scientific if you wanted them to be simultaneously kicked off.) - Or is that what a scheduler is for?