Selecting requirements and associated tests in a report

I have the following requirement in my project.

I have a release and the release is mapped to one sprint only. Basically each of my release will have one sprint only. The sprint is mapped to several requirements. Each requirement is tied to multiple test cases.  While the sprint is going on we usually send a couple of requirements to production from the current sprint (production issues). For this, I have to generate a report. Currently, I don't know how to generate a report for selected requirements and their associated test cases. I don't want a report for the entire release or sprint. I want a drop down list of all the requirements and associated test cases or test runs in the current sprint. I want to select the requirements from the drop down list in the standard section or custom section. How can I achieve this?

Thanks,

Sriman