Yes you can create a task for that group only and send the testing version of the product that you want, on my lab I test like that
Select the group>click on actions>click New client Task Assignment> Select McAfee Agent on Product>Task Type: Product Deployment> Create New task
So then you select all the productos of the branch that you want after save that task you can schedule this automate the proccess
oh, what a fool I am! I already had a 'Product Deployment' task on that evaluation subgroup, but since I created that task before I checked-in the new McAfee Agent, I thought there is no other possibility than to re-deploy the agent again, instead of thinking about selecting the new checked-in agent in the Product Deployment task.
Thanks for that hint
Full evaluation takes place now!