You can:
Add tool
buttons, including flyout toolbars 
, to toolbars, including
the CommandManager
Place tool buttons on more than one toolbar
Remove tool buttons from toolbars
Rearrange tool buttons on toolbars
Move tool buttons from one toolbar to another
Display
toolbars before customizing their tool buttons.
To customize tool buttons:
With a document open, click Tools, Customize, or right-click in the window border and select Customize.
On the Commands tab, under Categories, select a toolbar.
Under Buttons, drag a tool button to any toolbar.
With the Customize Commands dialog box open, in the SolidWorks window, drag tool buttons:
From one position on a toolbar to another.
From one toolbar to another.
From a toolbar into the graphics area to remove them from the toolbar.
Click OK.