The Subscribe All button at the bottom of the List Subscriptions section in Member Tasks gives you a one-click solution to subscribe a substantial number of people to a list. However, in memberships with more than one individual where only some of those individuals should be subscribed, then you would previously have had to subscribe them all then unsubscribe the unwanted individuals. Now, you can rule out individuals by clicking the Omit Individual link under their name before using Subscribe All.
(Where you have a set of search results which include memberships you don’t want at all, you can drop these from the results using the recently-added results filter to remove the selected result.)