assetivity1
Hi,
If I understand correctly, you want to have Header + Footer are blocks from JA Builder, right?
Basically, you will assign the menu item of that page to JA Builder template style, with this settings, Header + Footer will be JA Builder's blocks, the main content will depend on the menu item type of this page.
For example, you set menu item A with type of Single Article + assign to JA Builder template style, that page will show Header + Footer from JA Builder, the main content will be the content of that article.
Regards