This example uses the value of user to adjust the command bars according to the user level. If user is "Level 1," the command bar named "Custom" is displayed. If user is any other value, the built-in Visual Basic command bar is reset to its default state and the command bar named "Custom" is disabled.
Set myBar = CommandBars("Custom")
If user = "Level 1" Then
myBar.Visible = True
Else
CommandBars("Visual Basic").Reset
myBar.Enabled = False
End If