Many Thanks, I already know that documentation. Inheritance solves only a small part of my problem.
I have to create a fly-out menu which shows the second level menu and some content inside every fly-out. We have six main menu items with six fly-outs. Each fly-out has a web part zone, a user control, whatever to show the web parts from another page.
Now I need a solution to edit the contents inside the fly-outs. My first try was content inheritance, which doesn't work, maybe because i placed the web part zone inside a user control.
I also researched for a macro or a user control to collect and display the contents from another page. But I didn't find a solution.
What I'm currently doing is working which special document types placing them in the tree to define the contents instead of web parts, but this solution is very complex for the users and and the developers.