Hi!
For copy some command button you may use copy method. The following example show how to copy <Print...> button into custom menu bar.
For illustration I put to use example custom menu bar. Its structure:
Name of custom menu bar: MyCommandBar
<Close>;<Menu1> - Popup Command Bars
<Menu1> include two command buttons:
<CmdButton1> and <CmdButton2>.
You must create reference to "Microsoft Office 9.0 Object Library" (...\Microsoft office\Office\MS09.dll)
Procedure for copy of command button to <MyCommandBar>;<Menu1> between <CmdButton1> and <CmdButton2>:
Sub AddCommandButtonInToMenuBar()
Dim strBarName As String
Dim cmdBar As CommandBar
Dim ctlCmdButton As CommandBarButton
Dim ctlCmdMenuButton As CommandBarPopup
Dim cmdButtonNew As CommandBarButton
Dim btyControlsCount As Byte
'Set custom menu bar
Set cmdBar = CommandBars("MyCommandBar"

.Controls("Menu1"

.CommandBar
btyControlsCount = cmdBar.Controls.Count
'Thing to do without:copy command button with its properties
'into custom menu bar before last command button
Set ctlCmdMenuButton = CommandBars("Menu Bar"

.Controls("File"

Set ctlCmdButton = ctlCmdMenuButton.Controls("Print..."

ctlCmdButton.Copy Bar:=cmdBar, Before:=btyControlsCount 'If parameter "Before" is omitted, button will be added after last command button of selected menu bar
'Change properties of new command button
Set ctlCmdButton = cmdBar.Controls("Print..."

ctlCmdButton.Caption = "Print"
ctlCmdButton.BeginGroup = True
btyControlsCount = btyControlsCount + 1 'Command buttons count with copied button
'Also you can change change some other properties of command button, too.
'Shape group line after new command button (before last one)
cmdBar.Controls(btyControlsCount).BeginGroup = True
End Sub
You must watch one's step when you define command button what you want to copy - name of them must be punctual. For get to know command buttons names you can try following method:
For Each cmdBarCustomButton In cmdBar.Controls
Debug.Print cmdBarCustomButton.Caption
Next cmdBarCustomButton
If you don't keep command button in the your custom menu bar next time, you may use delete method on close form or application:
ctlCmdButton.Delete
Good luck!
Aivars