[quote user="Frank Deldjoui"]Do you know where can I get MicroStation macros?[/quote]
There are a number of example VBA projects delivered with MicroStation. Look in your MicroStation workspace \System\Vba\examples folder. Alternatively, use a Windows file search tool for *.mvba.
There are some additional examples on our web site.
Finally, VBA help is invaluable. It documents VBA comprehensively and also includes code snippets.