Assign test case to different build

[antia]

Hi

If a build have been created and I didn't choose to "Copy tester assignments" from other build cases. How do I assign test cases to the build?
I tried
Test Plan contents> Add/Remove test case to assign test case, but even if I choose the build I want to assign test cases to, all the test cases still show they are selected (become yellow).
There is no checkbox or something I can select for assigning test cases to other build.

So how everybody usually do if you guys want to assign some test cases from the test cases you ran in the first run?

[fman]

test cases are not assigned to build but to test plan
Responsible of test execution task (tester) can be assigned at build level => see feature Assign Test Case Execution

[antia]

Thank you.
This allows me to assign different test cases during testing different build.