Add test set to a release

Dear all,

there are some threads about this topic, but it does not solve my problem at all:

1) Create some test cases (e.g. 5000)
2) put them into a test set (or more)
3) create a release (e.g. 1.0.0.2)

Problem A: Go to Release, select 1.0.0.2, go to test cases. -> It is not possible to add here a test set. WHY? (If I search for the tx:80 then I can see the test set (and a save option appears) but it will not be added) - it is not an option here for me to add 5000 test cases (which are already in a set!!!)

Problem B: I can also go to the test set, select the release 1.0.0.2. When I go back to Releases then it is NOT listed  - also not the test cases. 

I already saw a comment like "Execute them, then they are in the list" - that does not work for me - It is very important to know which test cases are not executed (on this release) - and there is no other way. 

It would be great to have the option to add test sets to a release. 

Thanks in advance