On the forum
How do I Add a toolbar and a line or group within a tool bar:

　　1、Click Tools -> Customize.
　　2、Select the Toolbars Tap.
　　3、Click New and Enter the name of the toolbar Click OK.
　　4、Select the Commands Tap and Select the toolbar you just made.
　　5、Click the + in the button right of the dialog and add commands as needed.

To add a line or group

　　1、Select the toolbar in the Customize dialog under the Commands Tab.
　　2、Select the command below where you want the line.
　　3、Right Click the command and Select Begin Group.
　　4、Select Close.
　　5、Select Close again