Using the web version of BoosterHub (not the app), you are able to accomplish bulk actions. In the People module, click the tiny box inside each person's photo in the People listing, or use the Select Current Page or Select All buttons to choose many people at once. Once selected, the Bulk Actions button transitions from grayed-out to blue and you can click it to accomplish one of the bulk actions, such as adding or removing Tags, exporting to Excel, deleting members, designating Members and Non-members, and moving a Member to a different BoosterHub Team.