i am working with QTP9.2, QC9.2 with BPT, SAP add-in

we have totally 1000 test scripts and executed no. of times ( more than 25), resutls occupied more space

here my question is that how can we delete 20 test results for all 1000 test scrits at single click

Note: i am able to delete test results by each test script individually, but it needs so much effort

Can u provide solution