Model picture for all my project

Hello,
In my project, I have the same buttons at the bottom and the top of all the pictures, which of course the same effect.
I have tried to create picture with the predefined configuration (main, header footer)but I have noticed that the wizard creates not one header and footer of all tthe pictures but each time a header and a footer.
Is it possible to create a unique header and footer for the project, in order to only create the "center" of the picture?