You can now tag Header and Footer masters by right-clicking on the Section and choose "Set as Master" and then pick the type : Header , Section or Footer. The Masters Panel is now ordered according to the master type and you can also set which Header will be the Default one and same for the Footer, and they'll be added automatically to any new standard pages in your site.
Note: Once you flip a regular section to be vertical, you can then set it as master Header and once it is defined as Fixed inside the Scroll section in the Inspector panel, then the Header scroll effects become available, enabling you to apply Transition and Fill effects on Vertical Headers.

Please share your feedback and let us know if you have any question.
Naama
Great feature, well done team!
Great, I was already looking for this because I wanted to use the pre-designed sections as header and footer, but till that wasn't possible.