Hi there,
If you right click your existing command bars and select 'Customise', then in the next window on the 'Toolbars' tab click 'New...'. name your toolbar then click OK, this will create you a new blank toolbar. Then on the 'Commands' tab, scroll the first list down to 'Macros' and select it. In the next list there will be a smiley face called 'Custom Button'. Click and drag this to your new toolbar, then right click it and select 'Assign Macro' and select the macro that you want to activate when you click the button (or enter a name and record a new one). Then click close on the Customise or add more custom buttons - you can change the image from a smiley face in the same right-click menu that you select assign macro from.
Cheers