When setting up a property distribution report for cases, in the first tab you’ll want to select how the test cases will be grouped, and you’ll see a small selection of options in the dropdown there. There will be a second option for Sections, where you can select what folders or sections you want to include. Make sure to select “The following sections only” when filtering by section.
Then if you want to further filter the test cases to specific field values, in the Test Cases tab you can click the “change” link in the filters area to further drill down your test cases by options like test type:
Hope that helps! Let me know how it goes.