When you use the Group commands, under Draw on the Drawing toolbar, to group objects (object: A table, chart, graphic, equation, or other form of information. Objects created in one application, for example spreadsheets, and linked or embedded in another application are OLE objects.), you combine them so you can work with them as though they were a single object. You can flip, rotate, and resize or scale all objects in a group as a single unit. You can also change the attributes (attribute: An object or text feature, such as line fill or text color, that you can manipulate by using drawing tools and menu commands.) of all objects in a group at one time — for example, you might change the fill color or add a shadow to all objects in the group. Or, you can select an item within a group and apply an attribute, without ungrouping. You can also create groups within groups to help you build complex drawings.
You can ungroup a group of objects at any time and then regroup them later.
Group, ungroup, or regroup objects
Troubleshoot grouping in PowerPoint and Word