Grouping members in a Usergroup

Hi. I have made a usergroup and would like to put some of my members in that group.

One way to do it is to type in the member's name and click on "Add Member". Apart from doing this one by one, is there a way for me to simply open the list of members and tick on a checkbox all the members that I wish to put under that particular group?

Thank you.

I believe handtyping their usernames into the group is the only way to do so.