Global Archive/Category Mapping
You can now map a domain to a specific Archive, Category, or Custom Taxonomy, including all descendant posts.
In order for all posts within an Archive, Category, or any kind of Custom Taxonomy, you can simply map the corresponding item to the domain and then enable the checkbox for Global Archive Mapping.
Checkbox for Global Archive Mapping
When this functionality is enabled, all posts within any mapped Archive, Category, or Mapping will take on the mapped domain.