[Greg Titus]

I'm afraid not. Not directly, or in a way where you could assign resources to the QA Testing task.

One thing that you could do would be to make a QA Testing group with 2 milestones inside: Begin QA Testing (which would have a start-to-start dependency with some lag time on Software Construction), and End QA Testing (which would have a finish-to-start dependency on Software Construction). Then collapse the QA Testing group and it will have the correct start and end dates and duration.