I’m not sure to understand your last question.
If you have only one value to store, or you only want the last value, you don’t need to (and I don’t see how to) saveAs in below requests.
But the exec must be executed by the same virtual user (described in the same scenario, request_6 executed before request_7)
For better explanation, you really should send a SSCCE (see How to Ask a Question)