Would this global layout be using Sections? If so, it doesn’t have that functionality baked in. The closest thing you could do is use a plugin like Post Duplicator and duplicate your pages, then alter them.
Thanks for your quick response. Basically I thought about using sections in this global layout but as there is no functionalitiy for that I have to drop that idea. Duplicating posts doesn’t work for me because if there might be changes in the layout I don’t want to make them in 100 posts but only in the global layout.
Finally I’m trying to solve it with custom post type and advanced custom fields.