After you've pinned an app, move it into a group.
To create a new group of tiles, move an app's tile up or down until a group divider appears, and then release the tile. Move apps in or out of the group to organize your tiles for perfect productivity.
To give your new group a name, select the open space above your new group and type a name.
Tip: Save space on the Start menu by grouping your apps into folders. Create a folder by dragging an app's tile onto another tile. Move as many tiles as you want into your new tile folder.