Hello,
This is not supported by default in BoldGrid, and WordPress themes generally follow the standard of having the same heading on all pages. However, you can accomplish this by setting up a child theme, which is a safe way to make changes without damaging the source code of the “parent” theme (your current theme).
In effect, you may want to create an alternate page template that will display different header content. This is one way of doing it, but there are many different methods to do the same thing.
If you are familiar with basic theme modification at the code level, this should be fairly easy. If not, it is best to contact a WordPress theme developer.
Best,
Christopher M.