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Creating a Test Plan with Multiple Test runs


New to using TestRail. I have watched the videos, and am going through to learn how to set things up.
I have created a project with a single repository for test cases. I have created a number of test runs and would like to create a Test Plan including a few different test runs. When I create a test plan and click the Add Test Run(s) button, I am getting the last test run I created or worked in. Is there a way to select different test runs? Can I add multiple test runs to a test plan?

My guess is I have something set up incorrectly, but cannot find the issue.