You can create a new toolbar and simply copy the buttons you want from the Reviewing toolbar by Ctrl-Dragging them there.
I don't know the answer to your question so started with the macro listed at
http://word.mvps.org/FAQs/MacrosVBA/...roToButton.htm and came up with the following which gives the caption (tooltip) and the button ID.
Code:
Sub ShowCaptionandID()
Dim oToolbar As CommandBar
Dim oButton As CommandBarControl
On Error Resume Next
'Replace the name if you've used another toolbar
Set oToolbar = CommandBars("Formatting")
For Each oButton In oToolbar.Controls
'Check if it is a customized button
If oButton.BuiltIn Then
MsgBox oButton.Caption & " " & oButton.ID & " " ' & oButton.OnAction
End If
Next
Set oButton = Nothing
Set oToolbar = Nothing
End Sub
To find the commands in the Customize list, look under All Commands. You really want to find them on the menus. For instance FileOpen. Unfortunately, most of them are not on the menus.