Easily assign person(s) to subtasks

Hi all,

I'm wondering if there's an option to easily assign person(s) to all subtasks of a summary task at one go. In our situation, we would like to assign all these subtasks of a summary task to the same person(s). However, at the moment is seems you have to assign the subtasks individually, which is quite labour intensive. Does anyone of you know a good workaround?

Thanks in advance for your response,