Group Pictures Together On Page In. You will need to select more than one shape picture or object in order to enable the Group button. The Wrap Text option for each object must be other than In line with Text.

Hover over the Group options Select Group. Group shapes pictures or other objects. You can drag the single group around and move all items within that group at once.
For more info see Wrap Text.
Group and ungroup text boxes pictures and other objects in Publisher. You can drag the single group around and move all items within that group at once. Once theyve all been selected right-click one of the selected items and select GroupGroup from the context menu. Its easy to grab all the images at the same time.