If I understand you correctly, you are talking about burning a DVD on a Mac with menus and then duplicating it. If the DVD already exists, follow the above advice. If you mean that you want to take a set of wedding videos and create a DVD with menus and then create duplicates, use the iLife suite.
iDVD is set up so that you can create as many menus and submenus as you wish, drop clips into wells to create motion backgrounds and buttons, and drop clips into wells to create the actual DVD content. You can also include a slide show of stills and other content.
When you are done, use the virtual DVD player to preview your project and make sure everything works as intended, then save the project, hit the burn button and tell the app how many copies you want. Later on, you can open the saved file and burn more copies any time you wish.